You provide your customers with a service that gives them value. I've been a proton subscriber for 3 years because I value privacy and security. That's kind of (was) their whole thing. I didn't sign up hoping they would bolt on features and add a chatbot. I suspect that the majority of people using proton have a similar view, otherwise why bother with it?

Why can't they just provide the service people like them for and do it well? There's no reason to move at all, especially not if it means breaking things.