Interesting. Is it a huge deal if they miss their 30 minutes a day?
I probably allow my kids too much time with screens, but the flip side is that, if they don't have screen access for a few days, they don't really care. They'll read some books or play outside, no big deal. I get wary of setting hard limits on their screen time, because (knowing their personalities) they would then never accept if they didn't get that time for whatever reason, and constantly be trying to make sure they get their screen time, rather than the current state of affairs where missing their screens for a day or two doesn't phase them one bit.
It's a bit like a BBS, yes, and that's what drew me to the concept initially (I'm an early member of tilde.town; still reasonably active).
We do have an internal bulletin board, and an internal IRC (like the chat rooms of multi-line BBSes of the late 80s/early 90s). There are a ton of little projects by members, and the projects are pretty varied.