They fall into the following sub-categories, it is recommended that you carefully study the online gaming platforms that use this system.
https://debate.socialism.nl/forum/showthread.php?tid=237024
http://forum.bandingklub.cz/viewtopic.php?f=45&t=1573227
https://neoternia.net/viewtopic.php?p=729086#p729086
http://forum3.bandingklub.cz/viewtopic.php?f=39&t=1197729
http://www.prepody.ru/topic96725.html
http://www.horsecity.ru/phpBB3/viewtopic.php?f=5&t=186989
http://forum.spolokmedikovke.sk/viewtopic.php?f=22&t=1034714
https://www.silencertalk.com/forum/viewtopic.php?t=720414
https://mahayu.link/forum.php?mod=viewthread&tid=6815&extra=
http://forum.bandingklub.cz/viewtopic.php?f=24&t=1301956
http://fanprojekt-moenchengladbach-e-v.online.de/de/forum/tickets/22843-crypto-investeren-ook-holland-casino-betaalmogelij/60511.html
https://classic.darkml.net/bbs/forum.php?mod=viewthread&tid=10899&extra=
https://www.ww2.site/forum/viewtopic.php?t=76715
http://www.prepody.ru/topic58835.html
http://forum.spolokmedikovke.sk/viewtopic.php?f=18&t=1019955