MM vs ECN, one question still not asked

Hi!

I make some tradings in spot market of bitcoins and learned what means "maker" and "taker" and so I understood the reason of the CFD brokers are called of Market Maker. Isn't because the MM broker are manipulators of price and yes because are act to like maker traders, providing liquidity, and we, the customers, are necessarily the takers. We taker the liquidity of the broker.

This initial consideration is for repudiates the discussion of MM are manipulator/maker of price or not, this is not the focus of this thread.

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Look this simple comparison

#MM
-- Advantage
----- No comission
----- Orders executed instantly
-- Disadvantage
----- Spread

#ECN
-- Advantage
----- No spread
-- Disadvantage
----- Comission
----- Orders executed no instantly

Now, the question: Orders of buying in a ECN broker can be executed by bid price (buy by bid price means buy cheap = profit) and orders of selling in a ECN broker can be executed by ask price (sell by ask price means sell expensive = profit). So, the profit made due buy by bid price and sell by ask price is sufficient for pay the cost of comission?

Another question is the following: "Joseph and John are customer of X ECN broker and Mary is customer of Y ECN broker. Joseph can make trading directly with John (I have no doubt that, because they are clients of the same X ECN broker) but can Joseph make trading directly with Mary (who is client of another broker)?

EURUSD	1.12955	GBPUSD	1.32917	AUDUSD	0.64104
USDJPY	145.433	USDCAD	1.38314	USDCHF	0.83006

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