The trick to using eBay is that the seller needs to have a lot of positive star ratings and has a recent selling history - as in they do this to make money, it's how they eat. Not someone with a 6 star rating who hasn't sold anything for months to years.
If all buyers followed this rule, how would a seller opening for business for the first time go about building enough feedback to get started, especially with eBay's slow start rules for new sellers?
Most things like printers do not need to talk to the entire Internet.
Even with things like Apple AirPrint and Google Cloud Print? Or printing postage?
Companies [...] will stop making non-IoT enabled devices. [...] the devices will be designed not to operate without connecting to their "home base" advertising company.
Then there's an opportunity for a competitor to say in an ad "Do you want your food to spoil just because your Internet went out? You don't have to worry about that with a QSI refrigerator."
connecting completely different systems to the internet for the purpose of doing something other than computing
Define a "thing" and distinguish it from "computing" to help some of us understand. Is a printer a "thing"?
A little over a decade ago they said it would cost $3K/yr to support a handheld.
How much did cellular voice and data cost back then?
nobody wants to pay MS 30% of their revenue
Them explain applications in PlayStation Store, Xbox Live Marketplace, Nintendo's eShop, Apple's App Store, Amazon Appstore, Google Play Store, Steam, etc. Sometimes a 30% cut can be can be easier than buying SSL hosting, a merchant account, and store tech support staff, especially with the swipe fees that card processors charge for small purchases and the $5 setup fees that stores charge for MC/Visa/AMEX gift cards.
For the closed-source windows application that you are running on your open-source wine.
Not when the majority of desirable applications are rated garbage, as another comment points out.