At a "traditional" casino or poker room, when I buy some chips for $100, I know that I will always be able to get back that $100 for those chips. With crypto, it's a little different. Let's say, the price suddenly drops 20% against BTC and BTC drops 5% against USD, and suddenly I only hold 75% value with my BRO coins. Of course, it can also go the other way, but the infamous volatility of crypto currencies will always be a barrier of entry to those who are not at least a little obsessed with crypto.
A solution could be to offer tokens with attached values either in USD or BTC.
Another point about using crypto-based chips versus USD-based chips. Yes, the value of the crypto-based chip will vary over time relative to the USD or BTC. And that could hurt or help somewhat, depending on how long the holding period and how big the move. For those who like the gaming and not the downside (and upside) potential, they can just buy-in and cash-out each session. Then that exchange variability is pretty small, especially relative to the gaming.
On the suggestion of offering alternative chips based on BRO, USD or BTC, imagine the consequences. Chips in the same game at the same time wouldn't have -- nor be perceived to have -- the same value, and even those could change through time. So every casino has to have the same base for all their chips. That way entries and payouts have a common worth (unit of account). Makes for an even playing field, and a lot simpler.