It is definitely better if a account name has some recognizable link to photography.
Not sure I agree with that last little bit at all.
I know how hard it is to deal with the bots which are getting smarter and smarter everyday. But it is a fine balance, between stopping the bots and trying to make enrolling as easy, simple and fast
as possible for those that are real and want to join.
As forceflow suggested, using a form of CAPTCHA of some kind would help reduce this. Even if it means showing a picture with a maths puzzle and asking the person to calculate the total, or something else.
Approvals usually take as day or less to complete.
Not good. I probably would have joined another forum during that time, and would have no interest in returning here. And that is the danger. Anything other than pretty immediate membership could have dire consequences on the future growth of the forum.
Anyway, I wish you luck.