Is the only reason governments subsidize things for employment? Could it not just be here, have $3.1B and further us as a species by producing chips needed for

Is the only reason governments subsidize things for employment? Could it not just be here, have $3.1B and further us as a species by producing chips needed for AI, ML, cars, cellphones, etc. We give giant science grants all the time, tons of money for infrastructure, etc, what makes this one immediately go into X dollars / jobs created * tax generated?