If your threat model mandates that you use end to end encryption, go for it, and choose something other than Dropbox. But saying the encryption is pointless just because the organization that manages the keys could become “evil” is hyperbole.
Edit: to be clear, I believe it is an option on enterprise accounts to use your own key.
>foreverbanned: They didn't mentioned the filename at first. What they actually said was: "And a Basecamp user uploaded the 100,000,000th file (It was a picture of a cat!)"
AFAIK there is no equivalent Dropbox incident, though they were forced to clarify their marketing in 2011: https://en.wikipedia.org/wiki/Criticism_of_Dropbox#May_2011_...
https://www.theregister.co.uk/2011/05/16/dropbox_ftc_not_goo...
Since you’re running their software, you’re ultimately trusting their policies anyway. Even if they had encryption at rest it wouldn’t tell you that it’s correctly implemented and doesn’t e.g. leak keys.