I reported all of the cheaters. It took probably about 3 weeks to 1 month. There was over 11,000 platinum achievers when I started, and now just over 9,100. That is nearly 2,000 cheaters I removed all by myself mostly. The platinum rarity was 1.17% when I started and now at 1.00%. I've looked for more cheaters, but I have found just about all of them.
I'm surprised the mods allowed so many cheaters for years, before I decided to do something about it. I would report LittleBigPlanet 2 cheaters, but it doesn't have a report button for that game for some strange reason. I bet there are even more cheaters for that game than GTA IV.