If the casino owner has connection with people in this forum surely they will create ANN thread in this forum to promote and introduce their casino in the forum. but most of their new casino sites rarely know about this forum even though if their casino uses crypto or bitcoin payments they should know this forum, it's clear here is a place where active crypto communities as gamblers, traders and others gather in this forum.
I also think maybe they don't want to introduce their casino in this forum yet because they think it won't bring in any traffic, so they choose a way of promotion elsewhere or use their social media like other casinos do too, if only they knew that this is the right place to promote crypto casinos. maybe they'll create an ANN thread on this forum as well as run a signature campaign as well.
Don't get me wrong there are a lot of new casinos popping up in this forum and maybe some online casinos out there that haven't been on the forums because they don't know and don't have a team that can operate casinos using cryptocurrency payments.
There are several fiat online casinos in my country and I had a chance to chat with their support regarding the use of cryptocurrencies and their answers were all the same, that is, there is a fear of using crypto and also not having a reliable team in the field of cryptocurrencies.
But in the future maybe all casinos will start using crypto as their currency value and join the bitcointalk forum for promotion.