Earlier quoted context omitted.
Nobody is forcing the person in question to host an arch mirror. Being included in the official mirror list does not come without rules and if one of these rules is "don't have a shitty domain name", I don't see the problem. PS, domain names on non-egregious TLDs are 5-10 bucks a year.
Pissing on people who spend their hard earned cash and precious mortal time on serving your community is a great way to ruin it. I hope nobody ever has to deal with your leadership. I don't see the value in punishing community members for the high crime of being autistic weeaboos.
Alucard, the person in question, is someone who spends his "hard earned cash" trying to push the boundaries of every community he's a part of, just so he can get kicked out and complain about "SJWs" (keybase @alucard, look him up). I personally don't give a fuck, but people whose work solely exists just to stir shit up are never healthy for a community and you shouldn't be surprised when they're removed.
Maybe you think like that as well; maybe you, too, think all speech should be allowed in every community ever, with no boundary whatsoever. Maybe you think there's a speech-police armada out to get you, watching everything you write and analyzing it to send "anonymous complaints" when something's deemed too offensive.
What actually happened: Someone saw a fucked up URL in the mirrorlist, probably looked it up to make sure it wasn't serving malware, then reported the incident on the forum. An arch dev saw that and basically said "nope, not dealing with that nonsense" and removed the mirror.