@jwildeboer the first one, is that after exhausting all avenues, and in need of more funding to continue supporting, maintaining and developing Mastodon at the pace the community requires it was necessary to open another avenue of funding in the US.
Another reason would be a pre-commitment from some entity (e.g.. Meta/Threads) to pledge some funding, and the necessity of having an US entity.
In both cases, a board is necessary to form, and it is not always easy to do it. 3/