You can also buy boxed things and have the problem. For example FL Studio, you buy the boxed edition 300 USD, and all you get is a serial number. Once it's linked to an account, it's over (and it's actually the only way).

If legislators want to do something good, they could force platforms to allow transfer of games between accounts.

Doesn't this fly in the face of Vernor vs Autodesk and other lwgal precedent? Not that they can't change this, but legislators have a vested interest in protecting software rights