

The email used to be used to send you notices if your cert wasn’t renewed and other communications. They’ve just discontinued that feature, so the email isn’t super important.
It’s a good idea to provide a valid email address, but it’s not that important and doesn’t really matter for the purpose of issuing a certificate. It’s not part of the problem you’re having.
There’s YaCy. I’ve run a node for a while but it ended up filling up my server’s drive just indexing german wikipedia and the results were terrible.
And it’s still not private because you have to broadcast the query across the network.