money corrupts

This is exactly the reason that Proton became a non-profit:

https://proton.me/blog/proton-non-profit-foundation

Swiss foundations and their board of trustees are legally obligated to act in accordance with the purpose for which they were established, which, in this case, is to defend Proton’s original mission. As the largest voting shareholder of Proton, no change of control can occur without the consent of the foundation, allowing it to block hostile takeovers of Proton, thereby ensuring permanent adherence to the mission.