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The "distributed" part.

While distributed could mean a lot of different things, I'm guessing the OP wants either horizontal scalability, or bidirectional replication between multiple regions/datacenters. And while it's technically possible to do those with mysql or PostgreSQL, they definitely don't work out of the box, and require a lot of careful architecting, and it isn't really how they were originally designed to be used.

Also technically redis?(distributed might not be the authors version of distributed)

redis has clustering capabilities right out of tge box. So do mysql and mariadb. Postgres needs an extension like citus, however.

I don’t think they’re distributed without third party extensions?