We had an IRC channel before and you can create a new IRC channel within minutes, for example Freenode offers free hosting for open source projects since like forever, which almost all open source projects also used since almost forever. An IRC channel was deliberately not created and even before deliberately not advertised anywhere, so it was not well known.
It is also not about open source or political statements it is about complete ignorance, one person just decides "We do everything on discord now, screw everything that was before" without asking anyone and if you complain you are just told "fuck off". There is actually a long list of reasons why not to use discord and "open source" and "political statements" are at the very bottom of those lists for the most part. The whole business model is abusing it's customers and scamming them and the popularity was created through dubious methods like bribing youtubers etc to advertise it. But I already made many of the arguments, I'm tried of repeating them over and over, it would be much easier if you could read the arguments to begin with and make counter arguments based on that, but attacking me personally all the time does not get us anywhere.
Here are some more reasons not do use Discord: https://spyware.neocities.org/articles/discord.html
I also updated the main post to include that link as well, since it is much more detailed than the first link I posted.