I built a blog in 2008 with few articles and luckily got my account approved in Adsense. after a month I was banned for lifetime with reason of invalid clicks a

I built a blog in 2008 with few articles and luckily got my account approved in Adsense. after a month I was banned for lifetime with reason of invalid clicks and violating terms. I still don't know why that happened? last I try to re-apply in 2013/14, again I was reject for no reason. I can really see a monopoly of google in this ad-space. because they can always throttle our traffic if we use other network.