Closed models are used to pick military targets, which seems pretty trusty to me. There was also that time where every US government employee had to send a self-written review of their work to be consumed by a very closed source model, and that too was fine. It also seems likely basically all employment data in the US federal government has been fed into a closed source model, and again this was fine according to the government.
So it seems like there is little self-hosted open weight models cannot be used for.
So it seems like there is little self-hosted open weight models cannot be used for.