I don't know, maybe those brokers do not allow traders to make huge profits from them. That's their rules, so you need to follow them. If you want to hedge, then you should look for another broker that suits your trading styles.

You should ask them why. Every broker has their own rules to follow, they implement rules for the benefits of the traders and their company. It is not wise to question them because it is stated on the agreement after all.

It is because it prevent us from losses, and using that kind of strategy would miss their chance to gain profit from us.

I think hedging is available for all the types of Forex brokers around the world. It cannot be deminised because it's always a part in Forex to protect someone's account.

Because hedging is the most profitable trading strategies, according to the Forex experts that I had talked earlier.