These companies are still benefiting from the same government services which is what the normal corporate taxes are paying for. Saying the taxes paying for those services are also somehow pay back this free loan is very much double dipping.
On top of that, this is early stage funding and most of these companies will fail paying back little to nothing.
PS: Corporate taxes are down to 9% of the federal budget. They really don’t pay much in the way of taxes vs the services they benifit from.