I'd like something that broadly prohibited any company that 1) acts as a gatekeeper for any third party services, or 2) offers digital "purchases" from blocking

I'd like something that broadly prohibited any company that 1) acts as a gatekeeper for any third party services, or 2) offers digital "purchases" from blocking user access to their account without having to first prove overt nefarious actions that disrupt the service. And not some hand-wavy TOS violation, but it should be impossible to block someone more than temporarily without going through some kind of arbitration process. If a company doesn't want to deal with this hassle, don't offer up "Sign in with Google/Apple/Facebook/whatever" (I'm talking about Google/Apple/FB/whatever in this scenario), and don't "sell" digital goods that are hosted online.