man, can you even lurk first before asking about it.Believe me, its popular. Just that no one is really using it, standalone board sites had always been in a decline in terms of popularity ever since sites like Reddit hog the majority of online folks into its single huge platform.
Statistically, we're one of the most authentic Dollars replica site even back in the day when the others replica sites were still up. You can search on google about blog articles listing Dollars-esque sites and almost every one of them always stated something along the lines "dollars-bbs.org is the most accurate depiction of the site from the show compared to any other Dollars sites listed above, definitely a recommend to check out."
Now almost 12 years later since it first came up, we're the last standing Dollars-esque site. Everyone would've known about it, especially considering how much bigger the franchise's fanbase used to be, back when it was airing in 2011 and 2016.