Imho, if you're joining a group with a goal of meeting people to possibly have a relationship with, you want a group that:
- Is a community (people stay in it)
- Is growing or has turnover
- Has enough of a connection to make friends
And a particular note that you might not meet people in the group, but... the people you meet in the group might introduce you to other people.That's the way things used to be done before social/dating apps -- "Hi, have you met ____? I think the two of you have a lot in common..."
And by and large, it worked pretty well. Who better to matchmake than people who actually know both of you?