They'd have to buy Microsoft and say Adobe first. That's the level of control that Apple has.
Do they though, I mean, what does it take to do and maintain something like Apple does. The OS, the store, whatever and the hardware. Isn't there loads of previous code than can be used and such? Honestly asking, I just don't know, sure MS is a trillion plus company and so is Apple, but you see open souce Linux with decent software, done on a budget of what? The spare time of goodwilled people?
The only company lately I can think of did the whole thing recently was huawei, which is supposedly android derivative, but some explain its not, that when it was android compatible (it won't be moving forward) it just had android in it as a layer or extra kernel, as the os is multikernel/ microkernel whatever that is. Sure huawei is a huge company, but the os was a backup plan with no definitive push that only became relevant once US sanctions kicked in, as huawei prefered android, and prefered Qualcomm comunications kit for that matter. Only after sanctions they finished the whole thing and made it whole, with store front, multiple device compatibility and so on (watches tablets, reglfrigerators etc) so huawei was a mostly hardware company yet they did develop the whole thing in a not so long time under less than favorable conditions, so Nvidia can't do it? Its too much of a lift for real?
Don't know, I just wonder a bit about these things, we get so many games, as a matter of routine, yet an office product like MS office is soooo impossible, its either 60$ a year (more?) or free (libre office, google docs looked like garbage last time I tried them long ago) no in-between it seems.
As far as OS, its always oh my gooood! , its so impossible! No one can do it! You know don't know if it makes sense.