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.
All I say is that it’s not FOSS in the strict sense.
Neither the OSI definition, nor the FSF definition require you to allow your trademark to be used freely, nor do they require you to only host FOSS software for your FOSS software to qualify as such. The client and server software published as GPL and APL qualify as FOSS by both orgs that define the term. Vaultwarden is better for self hosting specifically because it is superior software for self hosting.