@Peternimmo @rotfarm @Poe @mho
While kinda true, there's a vast difference between trying to locate and read specific physical letters manually (among millions) - and software scanning server data.
On other systems it is a given that DMs are at least stored encrypted - Mastodon's private messages are plain text therefore literally no effort would be required to process them.
However that still requires access to the servers since data-in-transit is encrypted even if data-at-rest isn't.