According to this document (among others), Roblox users should be able to join 100 groups without having Premium on their account:
However, I am only in 7 groups myself, and whenever I try to join any more, the message on the group reads: “You have reached the maximum amount of groups”
This happens every time I try to join a group without having Premium.
The expected behavior is that players should be able to join 100 groups without having Premium, as most Roblox documentation seems to imply this should be the case.
Hello! Thanks for the report. We recently decided to remove this limit, and you should be able to join up to 100 groups without premium. Can you check again? It should be fixed now.