Any relay can choose what to show you and what not to show you.
Discussion
That’s fair. But they are knowingly censoring content.
Which content are they censoring?
Question would be if, in addition to withholding notes they can also tamper with
Since each note is signed by your nsec. I’m fairly sure they can’t modify. They can and have censored people’s notes. Selected not to show a given note or not allow some things in search.
🙄

That probably depends if their clients validate the signatures properly. Check the source code.