Discord Snap has to block many unusual activities, but I still see these:
* attempt to `ptrace` processes all the time;
* using 99% CPU;
* to work Discord needs some non-standard interfaces to be connected;
* Discord tries to track which other programs you run by default and shares it.
* too frequently restarting desktop integration snap until the logs make machine non-functional (got 500GB.)
* blocking other programs using desktop integration for file dialogs: latency of several minutes, sometimes dialogs never appear.
Discord is as dodgy app as can be. Hope we will not find it is actually another distribution of spyware.
Since programs with so many bugs and crashes are frequently prone to security issues, I recommend to replace Discord with another app that allows push-to-talk.