I thought Meta had been leading this charge for a decade if not longer.

Need a separate burner-style device for Internet browsing these days (these days meaning the last 15-odd years).

What software systems allow for 'freezing' a system in a particular state, and then upon each reboot returning to that 'clean but configured how I want' state?

I used to use some software called Reboot Restore (or something like that), but that was way long ago and may only work for Windows.

https://hannesweissteiner.com/pdfs/frost.pdf