Getting everyone to agree what "gain of function" means is a lost cause.

"The term GOF didn’t have much to do with virology until the past decade. Then, the ferret influenza studies came along. In trying to advise the federal government on the nature of such research, the US National Science Advisory Board for Biosecurity (NSABB) borrowed the term … From that usage, it came to mean any research that improves a pathogen’s abilities to cause disease or spread from host to host."

https://www.nature.com/articles/d41586-021-02903-x

The actual regulations sensibly avoid the term, targeting "enhanced potentially pandemic pathogens".

https://www.nih.gov/news-events/research-involving-potential...