I'm with you and I'll be honest with you: I don't care about the verbiage! That is, I don't care if it is a backdoor-written code or if it is a hack or if it is a bug, etc., etc., etc.! If someone has access to my cloud data, then I have an issue with that, period, and I don't care what the verbiage/reason is!

So, to not take any chances and err on the side of caution, that's why I encrypt
before I upload.
Separately, ages (
centuries, more like it, lol!

) ago, I was working on project at a customer that had a process to perform a daily backup of workstation files that were stored in the C:\<xxx> folder structure to some network folder. Again, remember this is "centuries" ago

, and a consultant I worked with had a Palm Pilot which, for some foolish reason or the other, he would copy/sync his data (totally unencrypted) into a folder under the C:\<xxx> folder structure.
Then, the project ended abruptly and he panicked because of all the personal and sensitive Palm Pilot data he copied to the C:\<xxx> folder structure, which were subsequently backed up on a daily basis to a network drive. He was about to send an email to the IT admin to delete all those files but I stopped him, reminding him that those IT admins are not paid a lot and that his email would only bring attention to his unencrypted personal and sensitive data, so better to just leave it alone!
If it's not your storage, you have no control on who can access your data, so one needs to take all the necessary precautions possible to prevent a harmful data breach.