It makes sense in the wider context of the republican party generally viewing free universal services as a bad thing - the push to privatize education, the push to eliminate or scale back public health care systems like medicare, the push to scale back public pension systems like social security.

A given politician might have their own reasons for wanting to privatize everything (profit, ideology, etc) but it's pretty consistent across the whole party that they aren't fond of any of these programs - I wouldn't actually attribute this to key donors.