On PC there is no prestige boosters. People sho just boost over and over again to to get prestige 99. No one is THAT stupid. But top scores leaderboards are full of boosters and you have very good chance of encountering all kind of teamed players in FFA games, especially Assassinate.
That's true, we don't have a *****_89. But the game mode specific leaderboards are filled with boosters. The sad thing is that even the better players boost now. Ever checked the Assassinate leaderboards? I don't think we have many players on PC who are able to reach 20k legitimately.