Believe it or not, Betnomi wasn't so popular and big casino in the crypto gambling world as the way some forum members think about them. They had created a great impression on the forum by spending some marketing funds. Betnomi wasn't a billion or a hundred million dollar company (gambling site) that it will become a hot topic in the crypto gambling world.
Betnomi spent money for promotion here but we can't really say how much money they had.
One way to see how popular some gambling website is would be to check how many visitors they have in day, month, and year.
There are ways to fake this, so I would always test personally, check social media accounts, activity in forums and their blockchain addresses and transactions.
Maybe we should start new topic only for posting and tracking known crypto addresses for all casinos.