" I suppose Google was just another me-too search engine and MS-DOS was just another copy of CP/M "

I think you're wrong on both your assumptions here. Search wasn't a solved problem, even the simplest forms of spam succeeded these days.

Also OS in general aren't a solved problem either, coz the hardware keeps going and people's needs change

These problems were and are hard to solve and rare startup can do it. Even to tackle the problem lots of reseach needed.