What is your opinion for cheaters?

They ruin the game. I spent almost 2000 hours playing CS GO competitive mode. At least 1 out of 3 games are ruing by cheaters. I checked at least 90% of my demo and they all get ban but it takes at least 1 or 2 years before they get ban. Now I don't care anymore about my rank because you can lose it anyway because of them.