anyone can contribute changes, but vandalism is all but impossible
can have multiple people with commit access, and that list can be easily adjusted as needed
history of a file is transparent, if you know the tools
easily forkable, eg if the original owner goes AFK
Cons:
GitHub can be overwhelming for less technical people
many here on lemmy don’t trust Microsoft (could always move to gitlab or something)
no connection between user accounts here and there (pro for me, but I can see it as a con)
I vote one of the mods takes the initiative and creates the wiki as a test run, and slowly add non-mods as needed based on contributions. If we don’t like it, moving to something else shouldn’t be too annoying.
The only mod on !personalfinance never posted, seems to be squatting communities, and there’s only one other post since mine about this one 4 days ago.
I would suggest to keep the community here, we seem to get a few answers in the comments, and lemmy.ml is federated with more instances than LW, which allows to leave the discussion drama aside.
Great to hear you are wanting an active PF community too!