The de facto chat client used by gamers, often at the expense of platform-provided solutions, so I hope mods let this fly. Screen sharing of a game window is something that Discord figured out before anyone else, and it still might be the only one in town that works well for that use case. I'm about to start doing more research to see if any other programs can be subbed in, because this sucks. Wario64 facetiously linked a story about Discord getting hacked and revealing government IDs right underneath this story on Bluesky.
Migrations like this happen when the other thing sucks. Linux usage even on Steam has tripled in the past four years, and these days if I'm not coming across a PewDiePie or Linus Tech Tips video about switching to Linux, I'm hearing my least tech savvy friends come to me to say I was right for the past 9 years and that their next PC is going to run Linux, if not a Steam Machine. People switch to Bluesky or Mastodon when Twitter becomes all bots due to incentives that Musk put in place, or when his company-sanctioned AI generates CSAM. People will switch off of Discord when enough is enough, and requiring ID uploads to a database that will certainly be hacked one day could be it.