In order to count as LTFF it has to be descended from the current LTFF and serve basically the same purpose, that purpose being to fund longtermist/x-risk mitigation projects in the ~$1k-$500k price range through an open application, and to not be OpenPhil.

For the sake of resolution, LTFF would still be LTFF if it...

• changes its name

• goes through a Ship of Theseus-like transformation where every role gets handed to a new person throughout the year

• splits into an AI safety fund and a biosecurity fund

And would not be LTFF if it...

• shuts down and somebody who used to work there starts a new fund that serves the same purpose

• starts a new AI safety fund and later the original LTFF shuts down but many of the same people work at the new AI safety fund

• gets eaten by OpenPhil

Let me know if I'm missing any other plausible scenarios!