Thanks for the feedback – and thanks for reading them despite the bristling. I couldn’t come up with a better way to put them … I know they’ll cause some people to tune out, but oh well, what can you do.
I don’t think these solutions are inherently unscalable, it’s more that there hasn’t ever been a lot of effort put into figuring out how to make things scalable so we don’t have any great suggestions yet. I wrote about this some in The free fediverses should focus on consent (including consent-based federation), privacy, and safety (the article is focused on instances that don’t federate with Threads, but much of it including this section is true more generally):
There aren’t yet a lot of good tools to make consent-based federation convenient scalable, but that’s starting to change. Instance catalogs like The Bad Space and Fediseer, and emerging projects like the FIRES recommendation system. FSEP’s design for an"approve followers" tool, could also easily be adapted for approving federation requests. ActivityPub spec co-author Erin Shepherd’s suggestion of “letters of introduction”, or something along the lines of the IndieWeb Vouch protocol, could also work well at the federation level. Db0’s Can we improve the Fediverse Allow-List Model? and the the “fedifams” and caracoles I discuss in The free fediverses should support concentric federations of instances could help with scalability and making it easier for new instances to plug into a consent-based network.