Discord does. It makes some sense, since Discord has a feature to broadcast what game you're currently playing (or anything you want), but I found it was scanning /proc even when I turned this off.

I didn't like that, and I spent a lot of time and effort working out various ways to keep it out of /proc (or anywhere else while I was at it- mostly with AppArmor) and ultimately ended up running it in a container with systemd-nspawn. This is still a little bit fiddly, but seems to work reliably and without any issues.