ActivityPub? Who cares about what JSON schema gets adopted?

Much more interesting is the why, not the how.

#1 reason to decentralize:

"Centralized enforcement of global policy to address abuse and misleading information is unlikely to scale over the long-term without placing far too much burden on people."

#2 reason:

"The value of social media is shifting away from content hosting and removal, and towards recommendation algorithms directing one’s attention. Unfortunately, these algorithms are typically proprietary, and one can’t choose or build alternatives. Yet."

#3 reason:

"social media incentives frequently lead to attention being focused on content and conversation that sparks controversy and outrage, rather than conversation which informs and promotes health."