Why?
Steam has never done anything to support ownership of games, their policy completely bans transferring licenses or accounts to other people or leaving them to someone when you die. Their next CEO is someone who has only known extreme wealth their whole life and gets the job because daddy started the company, when has that been a catalyst for societal good?
GOG is the only one to have advocated a different status quo, but they have virtually no marketshare that could pressure developers and publishers to accept more equitable terms beyond eschewing DRM.