I don’t see how that could happen. You can always choose another distro, or make your own if absolutely necessary. But I understand why you’re concerned.
Idk, where there is potential for data mining and money there is a will and a way.
I am worried about stuff that is widespread like systemd, KDE, GNOME, flatpak, a bunch of stuff which is mantained by companies like redhat and canonical, etc. I also worry stuff like what was attempted with the XZ backdoor becomes more common.
We can always hop to other distros but if the high level polished stuff that we’ve taken a long time to achieve gets compromised these safer distros may end up being a worse experience and set us back years or decades.
I think I am fine with home use Linux growing a little bit, maybe if we get just under 10% or so that can be good in terms of software availability and just more people working on open source projects. Too much popularity idk, I am not onboard with that rn.