Separate out the "central" bit of centralisation. I think we need DNS for all. A "secrets service" where people can put a short encrypted message - big enough

Separate out the "central" bit of centralisation. I think we need DNS for all. A "secrets service" where people can put a short encrypted message - big enough for an IPv6 address + future extendability - for all to see. Then users can swap keys, agree on a "secrets service" (or many of them) to store their secret/IP address, and skip any other centralisation altogether. Apps (open source or otherwise) can then leverage this service to let users simply talk directly to each other.