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.
In other places we also often see LGBTQ people often carry out gambling activities, but they prefer to gamble in physical casinos rather than online, because they often come in groups, In my opinion, Dr. Reece's research was only carried out in a few countries, where this actually happened, harassment, but if we explore deeper there are also quite a lot of LGBTQ people who are involved in physical gambling, maybe it depends on the casino owner accepting them as honored guests or harassment.