Look at how much chaos came from just adding a few million people in a month. I don't see a way that goes better adding tens of millions in the same or shorter

Look at how much chaos came from just adding a few million people in a month. I don't see a way that goes better adding tens of millions in the same or shorter period. The best way for Tumblr to do it would be to: 1: Open source it 2: Make it federated with other Tumblrs. Probably using whatever BlueSky cooks up, or some similar effort focused on big platforms. 3: Offer a managed version the same way they do with WordPress for the majority of people who don't want to run their own 4: Provide an optional ActivityPub extension 5: Telegraph that federation is coming for the still probably too big main instance(s) to give administrators time to decide how they'll handle it: mute, block, allow, etc. This gives people who eventually migrate off in 6/7 a clear view of how instances plan to handle it. 6: Add ActivityPub support to the main instance(s). Make it opt-in. 7: Wait to see how it shakes out as people migrate to non-Tumblr instances. By now, probably 2-3 years in, there will be enough diversity in platforms and hosting options that most people will have some place to go that's appealing. We already see minimal AP instance software popping up that focuses on providing people with a Linktree/Caard-like experience where it's only a profile that's exposed to AP instances. Maybe even sites like that will add AP support! Posts from these could replace newsletters. (I know, a common claim for as long as newsletters have existed)