Anyone will always be able to add you to groups. It's similar to anyone will always be able to send you a notification. If they can't spam you via DM, they will spam you via notifications. There is no way to block people from citing your key. But we can hide them.
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or you can flip that with whitelisting
A slightly off-topic question about groups: do you know why Amethyst, 0xchat, and KeyChat allow you to see the same messages on your profile, but WhiteNoise doesn't?
In Amethyst, I can receive messages and see them on those other clients, but not on WhiteNoise. Do you know why that is?
Via nip 42 auth on the relay?