I think the point is there was no elaborate scheme for these people to launder money. Talking about prizes we should mention that some online bingo sites offer you one million dollar jackpots on monthly basis that is not so ordinary thing for traditional bingo hall.
https://muchroom.ng/index.php?topic=82690.new#new
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=541079
https://www.ww2.site/forum/viewtopic.php?t=399087
http://oldsite.giessen46ers.de/fantalk/viewtopic.php?f=3&t=173307
https://my-mobile.eu/viewtopic.php?t=9254
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http://1.s.2.free.fr/viewtopic.php?f=2&t=353506
http://www.lada-xray.net/showthread.php?p=255440#post255440
https://catrachosporelmundo.com/index.php?topic=7399.new#new
https://talkingpoints.org/subx/showthread.php?tid=90219