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Hello OP good day and welcome to the bitcointalk forum. This is one of a great announcement threads created by newcomers here in the community because you do some effort and buy a copper membership in order to post images to become more professional in looking. Promoting your casino here in forum is a good option because here there are a lot of gamblers and for sure if your services is okay then you will be gain more customers. Good luck OP and to your casino.
The ann thread is simple and easy to understand. Key features are there, highlighted and most especially copper membership is already availed and the banner is well presented so I think I can agree on what you said there. It's not that this forum has a lot of gamblers but many people here are interested in crypto and those people might also be curious on other crypto service including crypto gambling.
I don't know if having an ann thread in this board can be considered already as a promotion but for me promotion is when your brand is being exposed in different places and it can be done through bounty campaigns, signature campaigns, and lastly forum advertisement.