By far the biggest risk for most projects is "nobody notices it and nobody uses it".
And if someone "takes" your project and uses it - you've usually still got it. Software is funny like that.
At least I can't recall any such cases.
Do you have any examples?
My app project is Apache for historical reasons and can't be changed. https://github.com/icosa-foundation/open-brush/actions
(and I'm not sure if I would move to GPL if I could but that's a separate discussion)
I regularly come across interesting libraries that I can't use (half of CGAL for example)