Oh so that explains it!

Starting in 2020 when I was a new professor, I was contacted by a company that works with Chinese families to tutor their students directly. I would be paid $400 an hour to teach them online remotely.

Originally I thought it was because of COVID lockdowns and that may be part of it.

But the opportunities have continued since then. I stopped doing it as my career has become more involved but I still get solicitations from time to time, so it must be because of what you say.