I imagine they mostly all do it, with the exception of maybe Tresorit, possibly ProtonDrive but I am not super familiar with them. Its actually a "feature" of c

I imagine they mostly all do it, with the exception of maybe Tresorit, possibly ProtonDrive but I am not super familiar with them. Its actually a "feature" of convergent encryption which Apple uses in lieu of true zero-knowledge e2ee like Tresorit.