Well, according to Parscale, they asked Facebook to provide this kind of support while HRC's campaign did not. They had FB staffer(s) that were active and helping them get the most out of their platform. The issue is not, for me at least, that they got this level is support from FB while HRC did not. That's more on HRC and her campaign strategy team than anything.
What is wrong and/or possibly illegal is CA using their surveys to scrape the data and personal information about those FB users, their friends, and their network. They hid that part of the operation from the public. FB stopped that kind of access for advertisers last summer, I think, after they figured out this happened.