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.
What Op means is offline gambling or physical gambling that discriminates against third genders that may be considered deviant.
Op also said that this LGBT+ prefers online gambling to continue gambling without discrimination against staff or other players in the casino because online casinos only need personal data when needed and the casino does not have time to research whether he is of the normal sex or LGBT+.
Actually it makes sense that LGBT+ in various countries may be considered normal but sometimes there is still discrimination between them so that LGBT+ feel uncomfortable gambling and choose online casinos which are more comfortable to use without other people knowing.