Re security issues: are you referring to the nameserver domains being available for purchase leading to a potential DNS takeover of potentially all .io domains?

Re security issues: are you referring to the nameserver domains being available for purchase leading to a potential DNS takeover of potentially all .io domains? Or the reliability issues with multiple reported cases of DNS failures? Not to mention the ethical issues mentioned in a sibling post. I did not know about these myself until just now. Yeah, I'll be skipping .io for my own stuff now.