You won’t leak too many players from an obscure link, no, but you’ll be leaking a ton of them if the casino makes it to the top of the serps, ahead of your sites.
Hopefully you’re all aware of this, and won’t be giving or selling too many such links only to regret it after the horses leave the barn.
This is a dog-eat-dog world and I’m not building my sites with bricks made out of doggie biscuits.