> And for others it would be just + hosting the server + admin the server + securing the server + keeping the server up all the time For trivially small amoun

> And for others it would be just + hosting the server + admin the server + securing the server + keeping the server up all the time For trivially small amounts of data it seems a massive waste of time and effort. If however, you are storing and verifying identity of 100's+++ of users within said domain then hosting that makes sense (pgp for email should probably work this way).