According to this document (among others), Roblox users should be able to join 100 groups without having Premium on their account:

Roblox Support How to Make and Join Groups Groups are a way for players and their friends to form their own mini-community with other like-minded players. Groups can battle other groups, assist in building, engage in discussions, and more. ...

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.

omg thanks for 10k views im famous