Re:Robinhood raises $323M at a $7.6B valuation
by Kranar on Monday July 22, 2019 @09:51PM
(#20503823)
What you're describing is illegal in most regulated markets around the world and certainly illegal on U.S. markets [1]. Brokers are legally required as per Reg NMS to offer the best quote to their customers.
https://en.wikipedia.org/wiki/Regulation_NMS