Have you got the numbers for it, and a proof that significant number of people actually use them? Searching for password manager I got to 16th entry before reaching an unknown author and ~40 positions before I reached anything really questionable. Even assuming the install numbers are not inflated, you don't get more than 10k users on the lower entries.

There are probably some scams down the list, but claiming half of them are without an explanation is just FUD.