About Reddit, they have more users and major traffic from the United States, then the UK and Canada, and then they are also popular in India, Brazil, Germany, Mexico, France, Australia, and the Philippines.
If you are not in any of these regions, Reddit will be very unpopular.
Especially in a populous country like China, Reddit is restricted, and in countries like Indonesia, Reddit is also restricted. Huge numbers of gamblers from all these countries participate in gambling, either directly or indirectly. Some gamblers used to participate through Reddit, but due to limitations, they are participating in other ways. Moreover, in other countries around the world, Reddit's other features have limitations, which is why casino and gambling authorities do not choose Reddit as a means of promotion.