A good rule is to assume all messages on the internet, even those sent end to end encrypted as being in the open. While breaking end to end encryption is difficult if not impossible for the average user, government bodies have much more capable systems. It was revealed a while ago that the US stores all encrypted traffic it seems cross the border “just in case” it ever needs to decrypt that traffic to solve an investigation.

Truly, the only real form of secure communication is via face to face private conversations irl.