r/rclone

This page https://rcloneview.com/support/blog/hard-drive-to-proton-drive-with-rcloneview makes me understand that even without using Crypt, my data would be encrypted by Proton's encryption feature. Is that so?

I understand Proton encrypts data on the source, before uploading, when using their own desktop software. I don't want to use it on Mac because it's a OneDrive-like thing that forces to move data to a cloud location on the computer.

So, I want to use Rclone, but don't understand how it would use Proton's encryption at that source.