I've read something more about that. 1) Discord might ask you for phone number if it find unusual activity with your IP, or something. Probably a tool to fight spammers or something. 2) Some servers might insert it to confirm invite, or something. We don't do that.
I dunno tbh. Discord is so weird! It did catch something related to what I was observing a long time ago, even though I never opened discord itself back then and I sure as heck didn't keep any cookies!
TBH, the biggest problem with them is that they require phone number. Discord and reddit do, if I get it right. But if it's OK for majority... then gotta figure out how to get through it. Do anybody know how to register at these two if you don't want to use your phone?