I would assume with these fund raising sites that they write a cheque to the vet. He, in turn, can donate the money to the feds to be deposited to the account they are currently using. It’s a large amount of money, but it doesn’t seem a difficult job. It’s not like he has to become the contractor.
Any person who has put his name and reputation into a project deserves the common courtesy of acknowledging his leadership. For someone to suggest he cannot handle the project is grossly insulting.