I’m asking this because one time, while browsing the GNU website, I noticed that some of the members’ emails had “gmail” on them!! And I asked myself how would that be possible?? And I think other members of the FSF had Gmail too. Why? Richard Stallman is against Gmail, so why would those memberse use it?? Would that mean I can use non-free software while advocating and loving free/libre software??
There are other issues with Discord relating to privacy, which would even with a libre client (I think there is one? Bettercord or fosscord or something?) be a good reason to avoid it.
But I understand that there are important communities on there.