EDIT: Here's what I initially thought... Hobbies would be anything hobby related, like videos on 3D printing, figurine painting, gundam kits, electronics, etc., while DIY would be for actual projects. So things like home remodel/repair and anything self-designed and self built. Does that seem correct?
I guess? You could ask pina if it would be appropriate. Tbh I don't think either of these comms get used enough for people to care.