I'd be interested in something like a lightweight CDN/replication with OAuth2 for logging into other instances. Each instance 'replicates' your original account but isn't itself the master. One can be promoted to master in the event of an outage effectively migrating your account.
Would make for some difficult security considerations given a rogue instance could attempt to hijack authority.
They can try but without the moderation tools at the core of the issue, the subs will be inundated with bot spam till it dies. There will never be enough admins with free time to replace all the unpaid moderators let alone their knowledge. Not to mention doing a hostile takeover of subs without any understanding of each community's values will serve only to piss off more people.
Besides cashing out a dying platform, there is no winning for Reddit if they keep this up.
It's the new rise of CEOs and millionaires seeking to milk the internet to the last fractional dime. Leave morals and critical thinking at the door. Every major company is doing this now, shutting out everything even remotely capable of being scraped into a LLM and paywalling what used to be free to satisfy post-covid shareholders. Accessibility be damned, line must go up.
Beyond that we have Google crippling the Android and Chromium open source code, Youtube blocking user accounts using adblock, Twitch banning sponsor spots who sidestep their pockets, and of course all of them are doubling down on AI with massive amounts of corporate sponsored IP theft and data laundering on an incompressible scale, suffocating any human content (see the Amazon book crisis).