1. The ones unable to effectively police shills and spam. I'd put Google in that bucket.
2. Those that turn a wilful blind eye to review fraud, as long as they boost sales, like Amazon
3. Those like Yelp or Glassdoor whose entire business model is built around extortion and a protection racket ("nice business you have here, it would be a shame if a bad review happened to it. Unless you buy ads with us, of course").
1. The ones unable to effectively police shills and spam. I'd put Google in that bucket.
2. Those that turn a wilful blind eye to review fraud, as long as they boost sales, like Amazon
3. Those like Yelp or Glassdoor whose entire business model is built around extortion and a protection racket ("nice business you have here, it would be a shame if a bad review happened to it. Unless you buy ads with us, of course").