[porcupine73]

Pretty much no matter what you put in, if there is a human behind the system doing the registration they're going to be able to register. I've seen some boards try to thwart even the human attempts by asking technical questions that someone legitimately trying to use the board would know. Anyone can answer questions like the sum of 4 + 5. But like for a board for a certain make of car, a true enthusiast might know the first year the vehicle was manufactured or something like that. Yes someone can google to find the answer to that too of course.

I haven't researched but my guess is there is a black market of sorts on the webs for forum accounts with valid username and password, so the smart bots if they encounter repcatcha it can't crack or antying like that will just prompt for a human to enter the info then go on its merry way.