I don't know of anyone using it in the first place...

Apparently it's used by about 10% of UK university students, according to a survey:

https://link.springer.com/article/10.1007/s40979-024-00174-3

I remember there being kind of a burst of articles about it on HN about ten or fifteen years ago, with a lot of commenters talking about their use of it.

That's okay, they're elsewhere.