I agree. I don't think any of the kernel developers ever signed up for reviewing malicious patches done by people who managed to sneak their research project past the ethics board, and it's not really fair to them to have to deal with that. I'm pretty sure they have enough work to do already without having to deal with additional nonsense.

I don't think it's unreasonable for maintainers of software to ignore or outright ban problematic users/contributors. It's up to them to manage their software project the way they want, and if banning organizations with malicious actors is the way to do it, the more power to them.