My local "neighbourhood" social medias are full of people asking for dog-walkers, and full of people advertising dog-walking services.
Surely if one is effective, the other shouldn't exist?
The industry you describe is inherently local, and that can make it tricky to find anyone willing to cover your particular location. Kids aren't going to bus three towns over just to walk your dog for minimum wage.
So an app does kind of make sense, in some way, to capture those larger orgs that do cover that area. Same way that takeaway shops often can't arrange delivery themselves but UberEats et al will happily be a middleman, and other takeaways that just want to deliver may not be obvious (e.g. closed-off kitchens in random empty buildings out of any sight of foot traffic).
No, the problem is not an app-based dog walking service. That's actually not a bad idea. The problem is that it was never worth $600m in any way, shape or form, but people think that it's a far better idea than you or I ever would, throw money at it expecting to be the only nationwide dog-walking app that everyone will leap on. In the 1-in-a-million chance they're right, they'll make so much money it's hilarious. But mostly what happens is the company just can't gain traction and grow that quick, then the investors demand to see results, they overstretch, branch out into any other related nonsense to get money (e.g. the spinoff services mentioned here) and then realise that it now costs twice as much to use their services and they don't have staff in almost any of the country that actually needs them.
As always... there's room for ONE such app. If you're lucky.
There's no inherent problem with the idea - people will pay to save their time, as a dozen frustrated people a day will attest to on my neighbourhood social medias trying to track down a willing teenager to do the work. They just want the dog walked because they've gone away for the week, they don't want to spend a month looking for someone local, reliable, with customer attestations, etc. when they can just click a button.
We *ALL* pay for convenience in things we don't want to have to do ourselves, down to the silliest, tiniest areas. That's modern life for the last 100 years. Of course I could change my tyres on my own. Do I want to? No. Of course I could chase 200 insurance companies on my own. Do I want to? No. Of course I could my washing up myself. Do I want to? No. I bought a dishwasher for a reason, even though it's a large expense up-front, maintenance hassle sometimes, and an ongoing cost over and above buying some washing up soap. The point is... I don't care if it saves me time. Because my free time is more precious than the cost of a dishwasher.
Is a dishwasher a luxury that few can afford in modern life, and me owning one basically lording it all ovre the peons who can't afford one? No. They're pretty basic white goods nowadays that most people have.
Additionally... snow-clearing services are literally a thing. Because not everyone wants to spend an hour in the freezing cold trying to get their car out if they could just pay someone to do that one job in advance. How would you find people willing to do that? Either some lengthy search and ringing around a dozen companies, or specialist websites, or... an app isn't actually a CRAZY idea. It's just an idea. What would be crazy would be thinking it's a billion dollar idea. It's not. It's a decent little casual sideline for people at certain parts of the year and they'll be paid quite minimally and the amount you can cream off their income to put some more custom their way is quite low.
Exactly the same as here.
P.S. I have just located a dozen places in my area (UK) that do snow clearance. We don't even have that much snow. However you can bet for damn sure that the schools I work for have snow-clearing / gritting services on their bookmarks for when they're necessary and some kind of comparison website is only a step away, and then some kind of app to request an emergency snow clearance NOW from any company willing to come out and do so (e.g. when someone slips and breaks their hip and you try to panic to make sure you're seen to do something)... not a crazy idea for a business. Just not a billion-dollar one.
As for not communicating with our own neighbours? You're missing that in using such services, you're actually meeting people from wider and wider circles all the time. The teenager doesn't have to be limited to their own village if they don't want to. They can get gainful employment, meet customers they never normally would have, and offer and be exposed to a range more services.
We're "not talking to our neighbours" not because we're all just hiding at home and never speaking to anyone. But because our circle has widened to the entire world and we select those people we most are interested in.
As I had to explain to my parents 20+ years ago... the reason I have my laptop and phone on me (even at Christmas) is because my friends are in the US, spread throughout Europe, Asia at the other end of the country. The people I want to school with? They're all working in the SAME TOWN they were born, lived and will die in. I have so little in common with them that it's laughable. Even a school reunion has never happened because nobody can be bothered to organise one to meet people they haven't seen in 25 years and have nothing in common with, especially if means traipsing a thousand miles from where they now live to attend it.
My phone is my work, my entertainment, my friends, my family, my school, my bank, my shopping centre... it's all there. Whereas my street is - quite literally - 10 houses of retirees, elderly disabled people, one or two families that I don't get on with. Why? Because I don't get to choose my neighbours. I do get to choose my workplace and friends.