“We don’t need our own backups. The cloud takes care of everything.”

Thinking that the free open-source software (FOSS) community will not find a way to work around whatever comes their way is the pure essence of ignorance. Remember when crypto was export restricted? Yeah, it got exported no problem. Only FOSS users had strong crypto outside the US.
If they try to repeat this with age restrictions, well, I use Gentoo and will probably be able to just put in a number which the OS then reports to whoever asks. Aren’t we all born on 1970-01-01?