Not a lawyer-nerd.
If a frontier model company, materially changes a prompt a user provided are they accepting exposure proportionate to the causal contribution and any duty assumed? Especially if you've voluntarily undertaken to do that, and the voluntary-undertaking doctrine, especially if its marketed for safety, since intervening to reduce harm is exactly what creates the assumed duty?
Seems like, intuitively at least, modify users input is a liability landmine.