Something like the multireddit function then, maybe? Custom feeds where you can add any communities that you want (doesn’t even have to be the same topic).
I don’t think it makes sense to combine the feeds at a federation level (which I think is what you’re talking about, but correct me if I’m wrong).
No I was thinking about a client side solution. I don’t even know what multireddit is but it sounds like that is what I meant. Though since [email protected] mentioned it, syncing of communities between instances could also be a cool idea.
Serious concern and asshole move? Yes. Gpl violation? Not sure. You could argue you are not restricted to do whatever you want with the code you receive with a subscription. But if you share the code, they don’t want you as a customer anymore and won’t give you new code. I don’t know if the GPL allows that.