I'm not sure if that holds - wouldn't additional work on the network encourage others to then add more capacity to recapture their share?

I've looked into it briefly, and came to the conclusion that the BOINC stuff (it used to be F@H but I gave that GPU to a friend for some CAD work) was more useful than crypto mining, because I simply couldn't mine enough to matter out here - a dollar or less a day sort of thing, with my annual power profile.