the thing about this is a "writing assistant" doesn't have to be integrated into the email product. It could be a product in itself. If the "business audience(?) was the most interested in a writing assistant" you've got a fucken great standalone product opportunity on your hands. A Proton-certified LLM writing assistant that is magically better and more secure than anything else out there is not something you coyly slip into the email client and nudge everyone to use.

It doesn't matter what reasons they have for doing this. Their method of deployment says more than enough to me. They know it's off-script and they know they want their fucken "audience" to do the marketing for them.