Does Discord have an OS/2 client? If not then I see no sense to use it for communication. As well as Telegram, Matrix etc. But Telegram
previously had a web client. Slack had both a web client and gates to irc and jabber. Now these gates are gone away, and web client no
more works with OS/2 browsers. telegram web client too. Though, I'm still using Slack via Bitlbee IRC to different IM networks gateway,
which I run on my Linux VPS server. So, I can connect to it with a simple IRC client from OS/2. Besides Slack, Bitlbee has transports
to ICQ, Jabber, Skype, Telegram, Facebook, VK, Twitter, etc. Of course, voice and video calls are unavailable from IRC, but usually text
is sufficient.