But as it gets more popular and a direct impact in their operations start to appear, it´s reasonable to think action would be taken, even making it illegal.
For now theres no need to fear of a sudden government ban because the chance of it happening is pretty low. Here where I live, bitcoin is considered as an e-asset and is legal to use unless you do something illegal and those poker sites took down by US and bitcoin are different. If one were to happen though, I still won't be afraid because no one can now that I use bitcoin unless I say it out loud.