Interesting. When I make a post on my test Threads account with one-way federation turned on (aka fedi can read my posts, I can't read posts outside Threads, which is all they've enabled so far), and it gets likes from the fediverse, it gets compressed into this "X likes from N servers" notification
I guess one thing this does for now is prevent a "user at racialslur-domain" from liking it and causing a moderation headache