This is not a complete truth. Yes, many of them are scam, especially the big, fat, ugly things the adblocks are invented to block. However, the need for a list

This is not a complete truth. Yes, many of them are scam, especially the big, fat, ugly things the adblocks are invented to block. However, the need for a list of contractors for works is also required, but things like yellow pages is sort of dead, and if you offer services - eg. you're a freelance photographer, designer, etc. - you need to make yourself visible somehow.