You think the Free Software movement are the worst offenders here? *Seriously*?!
Vivaldi is apparently proprietary despite being based upon Chromium (much like Chrome is).
And I don't see any evidence that the free software movement is any worse for this than proprietary software.
If anything, it's the opposite, with the latter presenting self-serving, self-promoting suggestions to the customer, and obvious and unsubtle "nudge" tactics.
When free software does this sort of thing, it's often the result of a commercial imperative or business model based on free software (since the two aren't inherently exclusive).
Regardless, you need your head examined if you think the free software movement is the worst offender stopping you from "doing what you want with your own computers".
Remember that time Microsoft were practically trying to force upgrade Windows 7 and 8 users to Windows 10? They weren't just ignoring refusals (and frequently "forgetting" such refusals and asking again or even upgrading without asking), but going so far as to intentionally override software designed and installed to force MS to accept that refusal(!)
That alone went beyond the remotest plausible benefit of the doubt, and that's before we even get into their use of "dark patterns", i.e. ignoring the standard Windows acceptance of the close button as an implicit "cancel" and instead treating it as "Confirm/OK" for the unwanted upgrade.
Oh, and ask Apple about getting to do what you want with "your" hardware.