[1] https://faucethub.io/news/post/138
And some of the list reviews of this mixer in some site whenever there's blender.io, there's no bitblender.io which is unusual but it might be just coincidence? AFAIK bitblender is one of the oldest(if I'm not mistaken) and they are known for their reputation so there's no way bitblender will be excluded from any list of trusted mixers.
And also I can't find their ANN thread here that's why asked them first when they contacted me to have a mention of their service on my site. Anyway, I might be ignored them if they don't have ANN thread or so.