The only significant motion I've seen in years in the AP space is Bridgy/A New Social and Wafrn. And while having investment and conferences isn't the only sign of life, it's notable that AP hasn't had once since the first in 2020 while AT is headed into its second building on all that started at the first.

It's neat that some websites communicate on AP, but every single one compounds the problems AT attempts to solve. You talk about software playing nice with Mastodon while AT is converging on standard lexicons and Cisco is investing in changing the nature of the relay for the better:

https://www.ietf.org/archive/id/draft-nandakumar-atproto-ato...

https://bsky.app/profile/ipv.sx/post/3mg4h4tncmk2l