I was also asked to endorse a few WSOs that discuss this topic, but refused.
To me, email marketing is a very personal way to market products. None of these posts or courses mention anything about actually using a product and liking it before pushing it on your list. There is no personal touch involved in picking products based on gravity, payouts, or upsells.
A good personal relationship is built on trust. Your email list members will trust you more if you share your experiences with a product before asking them to buy it.
If you are in it for the short term, then blast those fake reviews away. If you are in it for the long haul, then you better get your head out of your a** and start being open and honest with your list.
Just my two cents of the day.
(Happy 7th Birthday to my daughter, Maddie!)