@anderscs @admin I'm worried too... aren't tumblr owned by Yahoo? not a great business to be fair.
but, the great thing about the fediverse is separate bubbles can exist, so just because they're implementing ActivityPub does not mean we have to federate with them.
my concern would be them implementing features that would force other platforms to implement the same. Mastodon has done this already, but generally their intentions have been for the greater good, I'm not so sure about Tumblr.