Watch "Megalag's" youtube video on Honey.

Some of his allegations:

1) Not only does it steal cookies (under last attribution)
2) It ignores the "stand done" requirements
3) It has code to detect whether someone is coming from a test account, affiliate user, or whether someone is a new honey account (Think VW Dieselgate).
4) Honey claims that millions of codes are scanned, but this is not the case
5) It takes coupons down

Watch his video.