Demo slots operate with virtual credits rather than cash, so there’s no chance to win or lose real money. There are thousands of reviews of some of the most reputable casinos in the industry, which should be enough to make a shortlist and narrow down your list of casinos to only a few. 
https://www.clubhombre.com/mybb/showthread.php?tid=3631
http://forum3.bandingklub.cz/viewtopic.php?f=38&t=1158818
https://neoternia.net/viewtopic.php?p=605858#p605858
https://debate.socialism.nl/forum/showthread.php?tid=122237
http://forum3.bandingklub.cz/viewtopic.php?f=16&t=1366951
https://talk.hyipinvest.net/threads/313484/
http://forum.fretky.cz/jak-ji-naucit-na-zachod-fretci-toaleta-a-vse-kolem/jak-zwi-kszy-wygrane-pieni-ne-w-kasynach-online-maszyny-hazardowe-online-na-pieni-dze-t184616.html
https://www.ww2.site/forum/viewtopic.php?t=67606
http://www.prepody.ru/topic60262.html
http://forum.spolokmedikovke.sk/viewtopic.php?f=3&t=934240
https://talk.hyipinvest.net/threads/279592/
https://mmomakemoneyonline.net/threads/guevenilir-casino-siteleri-eksi-ilk-ueyelik-bonusu-veren-casino-siteleri.641542/