From the text:

> If a big enough “bad actor” joins here, and we are on the brink of this with major platforms having announced upcoming ActivityPub interop, whatever they do will happen regardless of the consent given by folks who think they can federate content but restrict where it goes. I’m not suggesting this as a justification to just make away with people’s data, but realistically this is going to happen eventually and I’d rather Mastodon has tooling and conventions available to deal with this rather than “we always hoped this would never happen” ...

" .. we are on the brink of this with major platforms having announced upcoming ActivityPub interop .. "

Anyone know which major platforms have announced ActivityPub interoperability?