I mean, there are no classifields that specialize only in cryptocurrencies. Take bitcointalk, for example. It's primarily a forum and the only consistency with my site is the creation of projects.
It's the same as the newspapers, they have classified ads but they're mainly made to deliver news and post articles. Anyway, don't be too rude with the suggestions given to you. Believe me, they're known developers and if you don't like the suggestions or opinions they've told you, they're not stopping you from doing so because you're still free to continue with the project that you have already started. But make something out of it and try to prove yourself with this project you have started so good luck still.