It's already the law in Brazil that online services and "terminal operating systems" must perform age verification in a secure, auditable manner. This presumably includes smartphones and computers, meaning you can't just run an arbitrary Linux distro in Brazil anymore. I expect similar laws to pass in at least a few U.S. states by 2030—places like Texas, Mississippi, Louisiana, maybe Florida...
When I say "the future is signed, verified code from bootloader to application level" I mean it will likely be backed up by force of law. No one complains about the mandatory safety features various governments require cars to come equipped with. The voices of a handful of nerds will go unheard when the law starts insisting computers come equipped with safety features also.