I suspect the arrangements on here are different to the VOD (not that I know how new members are vetted on the VOD).
Here the system requires people to answer 3 simple questions to prove they're not a robot and have some knowledge of veg or bio (even if they don't the answers can easily be gleaned from the wiki).
They are then held in a que to be approved by admin who usually check user name and email & IP address on the stop forum spam website. If they are listed thereon they get nuked. I have to say we haven't had any new applicants for very many months.
Re the VOD, I don't think it's a matter of money. It was confirmed some while ago that Paddy makes a small profit from the adverts and commercial links he has in place and since that time, following grumbles from members (one of which was me), he's not requested any further contributions. Don't know if he still does, but he used to run other businesses from the same platform so it could be those that are consuming band width. I'm not an expert, so don't put too much store in the preceding.