Other issues aside, a big problem that's stopping me from using Discord and other services is the requirement to link your phone number (either immediately, or after "suspicious activity" or other methods) and the "convenience features" that entails: Notifications to your contacts that you're on the same platform, appearing in their list automatically, etc.
There's no certain way to stop this, because blocking access to your contact list does nothing if a platform uses people who have you in their contact list as basis instead. There's always this uncertainty that even if there isn't such a feature or it doesn't work this way right now, what about the next update? Surprise, now my family, boss etc. know I'm a wyvern online.
It's easy to keep your identities separate with email, but phone numbers are a royal pain in the ass and I sure as hell won't buy a second SIM just to have proper isolation.
