I don't recall anyone saying "This computer will stop working in X years". In fact I recall Microsoft saying that Windows 10 would be the last Windows version ever.

And even if they did say the computers would have an artifically limited lifespan: It's bullshit. It works fine. The greedy bigcorps just want more $$$ so they exploit you.

Not that this personally affects me, since I've been running Linux for years.