Where "this" is using soft language like "by default" to hide shortcomings. I expect Protonmail to do more to educate users to be aware of how surveillance happens, whether a rogue employee enables the function on their end, warrant, etc.
"hide shortcomings" like what? Doesn't language like "by default" infer/suggest/imply that there would be circumstances in which they would save logs? And wouldn't an obvious circumstance like that be a warrant?
I think for most people the interpretation of "by default" means "we will not log your IP unless you enable it", i.e. the power is in the hands of the user. The complaint people are making here is that this statement should really have a clarifying clause saying "or unless requested to do so by law enforcement".
If you were relying on Protonmail to conceal evidence of criminal activity for you, you may not have thought that all the way through.