Not at all imo. (I am not sure this is irony, I would just use the word sad here which is more accurate)
There is no 0 dollar per month Discourse offering anywhere in the ecosystem. If you have a hobby project and are in a situation where you can not afford to either self host or use a hosted solution, then Discord becomes mighty appealing.
Again a bit of a misuse of irony. But I would like to point you here: