mullvad is based on sweden, which basically means the same as what you said about switzerland. mullvad's goal is also to provide privacy to its users, even if they aren't a non profit.

mullvad was raided by police once. the police had a search warrant, so mullvad wouldn't be able to do anything to stop them. the police left with nothing, because mullvad doesn't keep any information. there was also a post in their website explaining everything.
proton has been asked to give a user's ip and they gave it, and also removed their "we don't log your ip" text in their website (stuff aboht proton is all according to what i found searching about it, and i haven't fact-checked)

mullvad also doesn't need any email, phone number, name, or anything like that. they just use a login and password, and it can be payed completely anonymously, with things such as monero.

and finally, mullvad doesn't have a free plan, while proton does. and if there is a free plan, there is something giving them money to run that free plan. since most free plans of anything create money through data collection, there is no way i'm gonna trust that.