Most of the time it's not like they are meeting other people. The commitments are like family visits every other week, traveling, studying, fixing something at home and so on. Occasionally it's some birthday party or something. It's mostly that everyone is busy all the time. Which I do understand but it takes a lot of of effort to organize something.

You mean doodle? It still exists but since polls are literally built into every messaging app now, its obsolete. It could be relevant if you have a one-time meeting with people who dont know each other and dont have a common messaging app.

If you're German (or not), use https://nuudel.digitalcourage.de/ instead.

Don't remember the name but I used it couple of times in corpo settings. I think it weird that we have to organize meetings with couple of friends the same way we organized team buildings. I mean, weekends are for resting. Why everyone has everything booked months in advance? I spend every weekend actively but I don't have a lot of plans that I can't drop to meet someone.