I'm happy to see this announcement. However, just transitioning to a non-profit does not make an organization good. They can still be greedy and take advantage of their user base. That being said, it seems Proton's mission statement resonates with a non-profit type structure. When you are accountable to the shareholders, they become the priority.
Generally you'd want to strive for perfection, but not go crazy over it and mantain a balance in all things, risk vs. benefit, that sort of thing, hence the saying
If I remember right, OpenAi started with this model too, and they do lots of shady stuff.
Not that this is the plan for Proton, but I completely agree that simply creating a nonprofit that owns the for profit brand doesn't guarantee good behavior.