In the wake of the news of Fredrick Brennan's (8chan creator) passing, I was reminded that I too had some dream of creating an imageboard, but I never got around to it and I'm glad I did.
Basically, much like how 8chan was basically a fusion of Reddit and 4chan, my idea was a fusion of Twitter and 4chan, as in instead of boards, threads would be grouped via tags that anyone can create on the fly. The only rules would be to keep everything legal and all spam threads would be deleted. I never got around to it because of my limited knowledge of programming and servers at the time and I felt like my more progressive family members would disown me for creating such a site.
I'm glad I never created that site because I feel like most people who run community sites for niche and dissident audiences tend to regret it later in life and go down dark paths. Though, I'm not against such sites in principle, I just hope that if you create such a community that you are prepared for what you are getting into. At least Hot Wheels seemed to have enjoyed the final years of his life.