Hopefully, they will win the lawsuit. Indeed it is unfair to the developers, participants and all the other people involved in ICOs to ban advertisement on such popular platforms as Facebook, Google, Twitter and Yandex. It's a known fact that without promotion no business can survive nowadays, so they are literally trying to kill the ICO business by those restrictions.
I'm not trying to say that ICO scams should not be banned, but banning all the ICO ads is not how it should be done in the free world.
I agree with that. But I wonder if they can sue banks who forbid crypto currency transactions using these banks.
They really cannot win against banks because banks are under no obligation to provide their services to anybody. Of course if banks blatantly discriminate, they can still be hauled up in court. I suspect it will be the same for internet media giants. They can decide their terms and conditions of service and can decide not to service crypto companies.