They won't ruin themselves, why would they? I have never came up to that point of thinking that they will do self-destruction after purchasing and investing millions of money to CMC.
Well,,, we thought the same about Justin Sun and TRON and for sure all their community users also thought he could not possibly self-destruct but then he kept on making the wrong moves from Pornhub to Steemit,,, now people are angry at him instead of cheering his expansion. People just need to be careful and to do things with the right mix of ambition and intent.
I do understand your rationale. I would also think in that direction too. But then this is business and in most cases monopolizing a sector yields the highest profit. However, I do hope that CZ will maintain all level of professionalism required to deliver excellent and unparalleled service while handling or managing CMC
. BTW , binance is trying make the crypto ecosystem centralized system. First of all, binance ceo 
CZ has acquired CMC, which means that there is certainly a purpose behind it. We can only hope their intentions are good for crypto. We will find out in the next few days what their true purpose is. 
