Because the man understands economics and business principles.
Nations all over the globe competed, with their own vaccines, in order to make some of the money. Even Pfizer was not technically part of Warp Speed but competed in order to be excellent and to get out there early on. NY Times made a point of saying Pfizer was not part of Warp Speed in order to try to discredit Trump a little bit.
Every comma, period, “and,” and “the” in the Times is an attack on Trump but good luck.
Pfizer benefited from Federal funding in the form of advanced purchases of their vaccine candidate. They can say they weren’t part of Operation Warp Speed (and that may be technically true from a letter-of-the-agreement standpoint), but they got the same check drawn on the same bank account as everyone who DID get funding as part of Operation Warp Speed.
Pfizer didn’t want to have Fedgov standing over their shoulder the whole time looking at their development process and holding things up. What they didn’t account for was that this was President Trump’s operation and there was no bureaucrat sitting there asleep at his desk with paperwork waiting on him. Operation Warp Speed was wildly successful; moreso than anyone could have anticipated.