How does 212 make money from a market order that won’t go through exactly?
The hedgies pay them, you know… 
This is just not this works 
^ this.
Well, nobody does that. Large orders are limit orders; even in a highly liquid market, a large market order is pretty much financial suicide. Might even lead to regulator fines in some cases, if the order moved the market too heavily.
There have been many discussions about what constitute a “price” recently around here, I’m sure you can find a few easily. Lots of information on how markets operate and what the price means (or doesn’t mean rather). Worth a read 
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Yes this is the only issue I have with this platform I’m concerned for when I want to sell especially will only deal on limit now