I get confused that every second opennic's server does not resolve emercoin domains, flibusta for example
Any solutions?
I think the peering with OpenNIC was ended very recently, by this relatively secret vote by OpenNIC
https://wiki.opennic.org/votings/drop_namecoin in which Emercoin seems to have been removed from peering with OpenNIC along with Namecoin. I think the lack of disclosure and notice given by OpenNIC, especially in terms of mentioning Emercoin in this vote, and limited effort made to resolve the underlying spam issues in a more constructive way shows that OpenNIC weren't really a valuable partner to have. Perhaps I am incorrect about OpenNIC and one of the Emercoin developers can correct.
The decentralized DNS is one of Emercoin's most useful features, and I hope Emercoin is able to get through these times and continue to a good future eventually.