This isn't a momentous decision. I don't expect it to affect my Gather Experience™ in a negative way. Since I joined Gather back in the Paleozoic Era I've signed up for just about every group that's solicited my membership. For a long time I've noticed that groups, even the tightly focused ones, rarely provide content that has much to do with the group theme. I'll admit to having joined a bunch of post anything groups. This has enabled me to get new evidence that "anything" is a truly all-inclusive term.
I give up. I'm swearing off groups. They don't provide a way for me to look for specific topics that interest me.