I very much agree with the wording on the pact's page: I believe that a Facebook fedi project, and for that matter corporate influence in general, is a real and serious threat to the health and longevity of fedi and must be fought back against at every possible opportunity.
Fedi has been my escape from corporate machinations, and I don't want to see that erode over time. A corporate fedi project will draw a large userbase to itself, and that will make it very difficult for instances to maintain independence without cutting theirselves off from large sections of the fedi community. Corporations will try to shape fedi to fit their bottom line, and that will not be in the best interest of community members. I very much expect corporate footholds to be the start of embrace, extend, extinguish campaigns.
So I say make it as hard as possible for them to even try -- and send a unified message that there are no profits to be found here.
@TerrorBite @bristle @tech it seems that this only works when a masto user favs a lemmy user's comment. When a masto user favs one of my comments in a Lemmy thread, my score doesn't seem to change, and I found a comment from with score 2 (so at least one upvote) which I didn't receive a fav for in my masto interface.