I agree with Anon who estimated 5. I would say there are half a dozen regular bakers and another dozen or so solid Anons who bake when it is needed.
I would guess there are less than 1000 unique persons who post consistently. More Anons on social media (by orders of magnitude) only. This is in spite of censorship and traffic stifling.
Very few have left the show (although some have gone exclusively to social media).
The ride never ends.