The more important concern for the LGBTQ+ people is that they are being treated differently in a casino which may come under harassment. Also, the study says that people at the casino, the staff plus the public have shown discriminatory behavior towards these people.
How does that person know they are LGBTQ+? Is it because of the documents sent to the online casino or is there a behavior that is different from LGBTQ+ so there is discrimination against these people including from staff and other users?
I understand that LGBTQ+ is contradictory in some countries, there is still this ban even though LGBTQ+ is very strong in some countries, but I won't comment too much because for me LGBTQ+ is a contradictory gender.
Well bringing their partners and celebrating their time off with them could be a giveaway. Gay people like to kiss as much as heteros. But i think it would depends where you are playing at. Some places are more progressive than others and there are always drunk people in casino who have lost a lot could be provoked easily by anything. And i totally get why someone would rather gamble online then in crowds.