He scammed ICO investors when he did not fulfil a whole list of the 2017 ICO promises
He scammed ICO investors when he siphoned-off ICO funds for his own pockets
He scammed the winners of the 2018 Christmas wager
He scammed ICO investors when he created 10 billion EOS BKT tokens and kept 1 billion for himself
He scammed ICO investors and all token holders when he announced BKB token holders need to swap over to BKT otherwise lose their tokens/investment
He scammed ICO investors and all token holders when he claimed betking would buy back 10% of all token every quarter
I can add more but that list should suffice to show serial activity rather than a one-off scam. In my book that makes Dean Nolan a serial scammer

But everyone with a functioning brain can put "betking scam" into google and avoid!