But seriously, the lesson here is: END-TO-END ENCRYPTION

A site's "auto-encrypt" option is nothing more than some rando dude saying, "Trust me."

We use encryption because we DON'T trust.

Cryptocurrency folks like to say "not your keys, not your coins."
This applies to any encrypted information. Unless you encrypt with a key that ONLY YOU POSESS, your data can be read/used by someone else.