Sometimes, the referred player must bet a certain amount, as well.
http://forum.bandingklub.cz/viewtopic.php?f=50&t=1309444
http://daveandspencer.com/forums/viewtopic.php?f=6&t=747913
https://www.ww2.site/forum/viewtopic.php?t=94641
http://miweii.com/forum.php?mod=viewthread&tid=19395&extra=
https://forums.digitalpool.com/showthread.php?tid=17880
http://horsecity.ru/phpBB3/viewtopic.php?f=23&t=184255
http://sharecovid19story.com/viewtopic.php?t=2746142
http://horsecity.ru/phpBB3/viewtopic.php?f=22&t=233605
https://bj40.cn/forum.php?mod=viewthread&tid=1915&extra=
https://www.ww2.site/forum/viewtopic.php?t=121103
http://forum.ruchkontroliwyborow.pl/index.php?topic=10696.new#new
http://forum3.bandingklub.cz/viewtopic.php?f=30&t=1454359