There was some drama a few years ago where Proton provided IP addresses of some activist to authorities, so yeah, they will do so just as much as Apple will.
https://techcrunch.com/2021/09/06/protonmail-logged-ip-addre...
https://techcrunch.com/2021/09/06/protonmail-logged-ip-addre...
On the other hand, as described in the blog above, Apple does have access to your data, and uses some of it to serve targeted ads: https://proton.me/blog/iphone-privacy.
I wouldn’t agree that it’s “just as much as Apple” here.