Those meme posts about "You can just get it on Telegram, it's on Stoat, check it out on ..." started including Zulip at some point after I started talking about it and I like to think I changed the zeitgeist around here just a tiny bit.

Not that I necessarily recommend it for most groups. I'm not afraid to host big stacks if their front-facing stuff meets needs of the group, and it definitely is a big stacky thing.