If they want an easy rewrite they can just switch it to the Bitcoin Cash blockchain which basically an very easy swap for them and you can probably do 1 sat/byte or even less than 1 sat/byte. And the fees won't be an issue.

The problem is that nobody really wants to bet with onchain games anymore. It was big back in the day when bitcoin was created and most bets were done onchain back then however now you can just send your BTC to Primedice or any other casino and bet instantly instead of waiting for transactions to confirm and pay any fees.

If privacy is an issue then most casios are KYC free and some casinos even allow privacy coins, hence another reason why there is no demand anymore for onchain bets. Hence they can switch to a different blockchain but it won't make much difference.