Discord enumerates processes to discover OBS to turn on streamer mode, as well as being able to display what game you're playing. Disable the "share my current game" feature and there is no longer any ptracing

Are you absolutely sure that's the case? The OP in that reddit post seemed to suggest that he had toggled off game detection and whatnot. Scroll down to the thread where the deleted comments are.

It's proprietary software. You can't prove it goes off. And there's both history and evidence that things are going against user privacy.

I use Discord in a web browser for these reasons. The web sandbox has benefits.

Does the web version work on mobile?

I recall Slack's web app working on my tablet, but I think they may have disabled that now.