You've seen the news about various US states (and even a US-wide bill!) for operating systems to implement age checking - but exemptions could cause headaches.
Its more that ypur payment provider will stop working with whatever platform/store your game is on if the platform doesn’t require games to implement age verification.
So games would just generally stop working (out of the box) on linux, because steam or gog or whatever will only sell games that rely on OS age verification, because otherwise they would not be able to accept credit cards.
Why on earth would my bank or utility company need to verify my age though my OS when they have all my info already?
Its more that ypur payment provider will stop working with whatever platform/store your game is on if the platform doesn’t require games to implement age verification.
So games would just generally stop working (out of the box) on linux, because steam or gog or whatever will only sell games that rely on OS age verification, because otherwise they would not be able to accept credit cards.