They don’t need your permission.

When you trade on margin, it’s part of the deal. The broker puts up the money, to underwrite your risk. So it’s their money. They will do whatever they need to protect it and make sure they get back 100c on the $.

Don’t blame the player. Blame the game.

Learn the rules and only play with the big boys, if you have your own money and know what the big boy rules are.

When you trade with cash, they can’t do that, as you own your position.