@strizhechenko
Exact DNSException for ActivityPub domains was dns.resolver.NoNameservers, which is effectively SERVFAIL, and I doublechecked it with WireShark.

Next time I'll put together more representative lists, but given how much the popularity of domains in both of those lists supposed to differ across the set (first 1000 of OONI is not most popular websites, they are rather random), such a drastic difference in availability does not make much sense to me.