I find this move concerning, and wish that the Founder had looked for a new CEO that shared his values rather than a Private Equity and Mergers Expert.
Furthermore, the change to the GRIT motto is worrying. Trust is useless without Transparency when it comes to code and security.
Non-profits do not always remain non-profits, and can become for-profit entities. Being a non-profit is not a reason to move to proton IMO, but Proton should be a decent temporary option if Bitwarden becomes aggressive to the open-source ecosystem.