My own "justification" is that while self-hosted is my main personal store, I maintain a paid but empty account with Bitwarden. Said empty account on their servers is to be the emergency access person for family members' personal official vaults. So, they get some money for a license out of me, without the server usage.
I subscribed for two reasons: 1. To support their efforts and 2. They accept Bitcoin (and of course I paid with Bitcoin although the whole payment processing was garbage).
Similar here... I also trust them to maintain their service slightly better than I trust myself to do so. I like supporting the project in general as well.