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exactly, I don't know what hinders other businesses implementing and adopting LN when we all knew the good effect of this in their business and subscribers/users .
Probably because even though it is a very secure network, there are still some risks of compromise. That could be one reason why there are only a small number of online casinos that have LN implemented as their payment method. It is indeed a drawback in my opinion (I'm not sure if it is a total risk or not), but I believe the risk should not be neglected.