Never believed in paid promotions. If I have to give money, I'll give it to my players. That's why we often switch to 0% house edge.
I dont think he is referring to paid promotion only as he is talking marketing in general. There are many marketing strategies, giving money to your players through competition/contest/bountiy can be considered as marketing as well.
No. This game is unique and I am not aware of any other platform that runs a game same as this, i.e. relying on last digit of the block hash that confirms bet transaction.
Your game is unique, no doubt about it and it is absolutely fair too. However being unique is not enough now to compete in the gambling industry, the market of your game is not that good compared to other games such as dice, slots, sports betting, poker, etc. Anyway I appreciate your struggle, you have been running for years although you have really low traffic. I think other person would have shut the site down and get a new more potential project.