Avast, the cybersecurity software company, is facing a $16.5 million fine after it was caught storing and selling customer information without their consent. The Federal Trade Commission (FTC) announced the fine on Thursday and said that it’s banning Avast from selling user data for advertising purposes.
I haven’t looked into Proton, but BitWarden is open source both server side and client side.
Proton is open source as well. Free tiers are supplemented by subscribers. https://proton.me/support/proton-plans#proton-free