[skybrian]

It seems like the main issue is consent. If you're using a library in a way the author didn't agree to, that's fine, but you don't get any guarantee it will keep working after an upgrade.

If you want to do that, you could edit your own copy of the library's source code and nobody will mind. Maybe that's enough?

It seems like you shouldn't be able to publish a crate where you're using an upstream library in a way they don't consent to, because now you're involving others in this dispute. A basic requirement for publishing to a shared open source ecosystem should be that you're resolving any disputes you have with upstream libraries and not just going your own way.