Brokers of information of that degree, fundamentally, pick no sides. The democrats are just easier to utilize that particular strategy on because they are animals who think with their crotch as a modus operandi.
It is likely democrats who were the frequent customers for data on other democrats. The party is dominated by totalitarians who will waste more time and resources destroying even the smallest amount of dissent among their own ranks than they will invest into targeting their opponents.
Though there is more to the intelligence network than blackmail.