I like this strategy of CZ , he buy good things when he can't compete, he bought CMC , and many other websites , now when he found out with Uniswap growth he is adding it, and very soon I think he would buy that website to own it like what happened with Wazirx .
not possible for them to buy that exchange for a reason that they have their own DEX , The better thing they need to do is to upgraded the platform they have and add more function that uni swap have not to always buy anything just for the sake of competition .
Adding that in binance exchange means another hype for that tokens and that what binance is also looking its another possible profit for the exchange if many people following this hype. More traders to buy that tokens in their exchange means more possible earnings for them .