How sure are you about this? Karpeles has admitted at trial to running bots on Mt. Gox, and such bots are implicated in the rise of Bitcoin's price up to $1000 in 2013:

https://cointelegraph.com/news/mt-gox-trial-update-karpeles-...

https://cointelegraph.com/news/new-wizsec-report-points-to-d...

If Mt. Gox successfully manipulated the price of Bitcoin using bots how do we know other exchanges aren't doing the exact same thing right now?