A computer was anyway. These services arent necessarily reading our messages personally, but the algorithms parse them for ad placements or whatever, and it probably got flagged as being unreadable.

Edit: Some services that arent intending to be secure chat might not like the idea of encrypted content on their system either. What is it? What are they now harboring which wasn’t their intent at all? Like if you made a lemmy community and only had encrypted messages on it, a mod from the server might have something to say about it.