How utterly and ridiculously hilarious.
Do you actually believe that the incentive was to speed development? Do you actually think that any vaccine-manufacturing company needs any incentive to speed development? Do you think any vaccine-manufacturing company is worried about having enough buyers should they be the first to come out with a well-tested and -regarded vaccine?
No, lol.
That $2B purchase order isn't an incentive to speed development, because no incentive is needed; it's just the US calling dibs.