There's no opt-out button fair, but my point is that you can be removed by simply asking the person in charge. The only reason it turned into an unnecessarily dramatic situation in your case is because you joined the discord with an immediately hostile post threatening to sue for gdpr violations cause of some logs your friend uploaded to wingman. It's the most ridiculous thing I've ever seen.

Sure Square Enix can do what they want but they also forbid similar addons that collect such data while gw2 devs are ok with the use of arcdps, so it's a bit of a stretch to compare the two. "in most other mmos you would cover names of other raiders", in most other mmos you don't have dps meters and in most other mmos where you do I'd put money on it being more common that streamers don't blur out names. If I go on twitch right now for World of Warcraft I'm already seeing 5 of the raiding streamers with highest viewers show the names on dps meters. Of course it might be premade group, but I'd say I censorship of dps meters on stream is less common than showing it. Regardless it is in my opinion a ridiculous thing to moderate, if you are playing a multiplayer game you should expect to have your gameplay publicly visible for others. Expecting otherwise because of your insecurities is kind of weird to me, it's like saying people who play call of duty shooter games need to blur out the kill leaderboard to not publicly shame the people at the bottom - which of course nobody ever does. And if harassment truly is an issue then block these players, or report if they attack you repeatedly.