> it's basically a waste of time to address this as an issue.
It's just as much of a waste of time to defend it. Arch has hundreds of mirrors and dozens come and go every month. Dropping one takes less time than it took me to reply to you here.
> It's just as much of a waste of time to defend it.
If by "defend" you mean "not spend more money on registering yet another domain", then I'd say it's worth defending. A hundred dollars is worth at least a few emails, especially if it is at the expense of a productive community member, on behalf of some anonymous whiner.
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.
Domains don't cost hundreds of dollars if you really don't care about the name. You can find some for $5 a year for one which nobody needs to remember/type.