I'd personally do the same. I wouldn't want to be bothered by the future maintainers' choices and get feedback/flak for it. It's a well-known and well-respected way to cycle the name with a "-ng" or "-nx" prefix to signal that this is the newer project with a different set of maintainers.
Being MIT, while is not my favorite license, doesn't give free license to grab and run with things.
Honestly, in my eyes, 3.8K or 38K stars mean nothing, because Open Source is not about you [0], to begin with.
[0]: https://gist.github.com/richhickey/1563cddea1002958f96e7ba95...
Finding a successor is also not easy nor cheap (in regards to time).
3.8k stars and the name is years of built up trust with you, not with the person you gave it to.
Oh yeah, I'm sure you will find lots of competent people. Like Jia Tan, for example. I've heard he is very competent.
Why is it never the responsibility of the people using it?
If anyone cares enough they will. People didn’t care enough to pay, so maybe no one cares enough to fork and be the new unpaid custodian