Oni 2 creator here. Agree with your concern 100%. We're working to review the license and come up with a better fit with more clarity.
We really just want a license that says - free to use for educational / non-commercial purposes, but a license is required to use in a commercial environment. No real "drop-in" licenses to support this, unfortunately. Some additional thoughts about our considerations here: https://www.reddit.com/r/neovim/comments/ae7ef6/question_abo...
The work that we want to share out (custom widgets that are more generally applicable) will live in Revery - that's the reason we split Revery out from Oni2 into an MIT Licensed project - so that we could share the heart of the work out with a broader community, and get help building out this foundation, too.