It's by definition anti-competitive. Its entire purpose is to reduce competition so that the inventor can profit from it. Even if inventors were required to license their inventions to other people for a truly fair rate it would still be anti-competitive since it would increase the costs (and thus barrier to entry) of competition. The inventor still enjoys a significant advantage in the market (not having to pay the license fees).

It's fair to ask if it's bad for there to be an official form of anti-competition, but call a spade a spade.