I think gambling casinos that having ads here in the forum are totally safe, members who have been promoted gambling casino will know better what they are going to promote not only accepting payment. They have a good review and feedback even if they are not participants of the gambling sites thread as what they had experienced by using on it. Most likely gambling casinos here are using bitcoin and some altcoins to deposit.
Do you mean, we should trust the casinos which are well known on this forum with it's bounty campaigns? It actually is not just enough to point a profitable project for ourselves. We need to look for various background of the platform so that we can trust the team behind it and can gamble on the platform without any risk.
Also, the DECENTRALIZED gambling platforms uses major cryptocurrencies as their payment mean whereas CENTRALIZED gambling platforms uses Fiat currencies or their chipsets on their respective platform.