It's okay to have policies against shitty code, blatant copyright violations or being an ass.
It's not okay to ban tool use when a person is honest about it. The only thing you can achieve with a ban is that people will learn to lie about it and conceal it better.
It's not my policy, and I don't personally agree with many/most of them.
But they do objectively exist in many desktop Linux projects. If you are the sort of person that sees software as "dead in the water" from AI prohibition, desktop Linux will feel like a mausoleum compared to macOS or Windows.