blocking hetzner ipv6 is a security concern for us because they every regularly use entire /64s to attempt to DDoS us. preventing a service from functioning is a whole lot different than preventing federation because you don't like the dude who wrote the software and trying to equate it to that just makes you look foolish. I'm not advocating for the blocking of them but I am absolutely going to block hetzner ipv6 for our security.