And what prevents some political party you don't like just use money to buy data from FB directly , or if getting the data is harder this days use the ad target

And what prevents some political party you don't like just use money to buy data from FB directly , or if getting the data is harder this days use the ad targeting and get same result that you don't like(make some people stay at home and not vote for your favorite and mobilize the guys in the group you don't like)