Magin requirements
Margin call is a broker's demand on an investor using margin to deposit additional money or securities so that the margin account is brought up to the minimum maintenance margin. Margin calls occur when your account value depresses to a value calculated by the broker's...
ECN Brokers are not like this. I work at FCI Markets and we do not take these actions. It is against FCA Regulations to move markets in the sense shown in the video.
It's a little naive to think that ALL Brokers cheat the markets and their Clients when in actual fact, it is very few brokers...