Sure. If those are terms of the sale then those are the terms of the sale. The seller offers terms. The buyer either accepts them or doesn't.
>> Think of banking apps, for example. Banks usually do not favor a tampered OS.
Ok, something of a different case, but sure. Banks offer a service, and decide which platforms to offer it on. Banks have denied customers access to banking to specific clients all the time. Lots of Web sites have died for lack of banking services.
If the seller is not willing then there's no transaction to be made.
>>Suppose you buy a device; further suppose the state is not involved (no warranty). Your device breaks down the moment you bought it, and there is no refund. How do you deal with that, especially if you are low income?
This has happened throughout history forever. It's so common there's a -latin- term for it (buyer beware) Caveat Emptor.
Which is why govt -does- get involved. And why, well, do your research before buying.
Obviously all sorts of industries have all sorts of regulations. Companies take liberties. Govt adds regulations to limit egregious behaviour. But fundamentally the seller offers something, negotiate if you like, or walk away.
Fundamentally you're not -entitled- to anything. If you don't like it, don't buy it.