You do wonder what the young will do when they're even just a bit older, if all they can lay claim to is being "an influencer". The smart ones will re-invent themselves numerous times I guess. Right now, I'm told, the ideal influencer is a late 20s, early 30s good looking female. That's a pretty small demographic from which to choose, and of course you don't stay in that age range for long, even if you are good looking.
As for making money, there's money from Youtube and the like - but that's just pocket change. The real money comes from sponsorships - you find a business somewhere, it could even be the local coffee shop, or maybe the local engineering company, a makeup company, a supermarket or whatever. They pay you some amount of money to include them in your next video/podcast/whatever. You either do a whole section on how you just can't get through a morning without some Buzz Coffee, or do a whole 'demo' of using their makeup products, or maybe you just mention them in passing, or flash their logo or whatever - I guess it all depends on what you contract with them.
Of course, the really "smart" influencers sell you stuff they own - dodgy business training courses or whatever, which are largely just a series of online videos, with some sort of in-person or video conference fluff every once in a while. They make it all up once, sell it dozens of times over for some decent money (and minimum ongoing effort), all promising that you could end up with their lifestyle if only you sit this course.
Then of course there's the 'manosphere' type blokes who buy agencies that find and promote (say) OnlyFans models. Then they feature those models in their videos, either directly interviewing them or perhaps just mentioning them as part of something else. Thus, those models do better, the agency takes their cut and you collect from the agency.
Ultimately, it always falls down to some sort of advertising and not traditional "honest" TV commercial or billboard style - much more like product placement or paid-for recommendation. In some countries (like mine), they have to display #ad if they're being paid to do or say anything in the video to try and make it a bit less deceptive.
But this story is about the smaller players - the ones with a relatively small following (what you might describe as an "achievable following"). They're arguably more "authentic" because they're not selling their entire lives like the "big" players. Hiring 100 smaller players could arguably be more effective because it's a form of astroturfing. It means the audience might hear about your product in one place, completely ignore it, but then gradually become interested because they hear about it again somewhere else and mistakenly believe "everyone" is talking about it now, "so it must be good".
This new trend suggests to me that the "big" influencers are losing their effectiveness. They've only really been at it for a few years and it's already coming to an end. The smaller players will likely end up with the same fate, but they've got a bit of time before that happens to collect some money. Sadly, they're unlikely to "rake it in" and become sufficiently wealthy through other means to carry on when the decline inevitably comes.