The existing Postgres license already has an "as is" disclaimer, so adding this clause means you want to _punitively_ punish companies that sue you for reasons outside of this software. The interpretation then is you want to punish users of your software that find themselves in a (potentially legitimate) situation to sue you over unrelated matters.

For example, if Supabase failed to pay a vendor that happened to use OrioleDB they wouldn't be able to sue you for damages without compromising their stack. That's uncool.

My take-away from the Facebook/React license issue was that the community agrees this violates the spirit of FOSS and invalidates claiming to be open source (at least OSI-approved), with many taking offense to the punitive nature of the clause.

Granted Facebook was in a position to see litigation over a lot more reasons.