I’m just a bystander who has never hit the “like limit” in my life, but larger issue here seems to be the entire concept of a limit is confusing — seems reasonable for a user to get mixed messages here: likes are good and useful mechanism that you should use, but…not too much?!
From what I’ve seen, some users never use likes at all and some enjoy liking as much stuff as possible. Since it’s never really going to be the case that all users use “likes” in a consistent way, what negative consequences really arise from letting users like to their hearts content? If it’s server constraints or actual spam indicator issue, maybe there’s a simple way in the messaging of indicating why the limit exists so it feels less arbitrary.