Looking for ebay amazon feedback farming

Looking for groups for feedback farming ebay and amazon. Basically groups where sellers want to build their feedback and are looking for genuine buyers in exchange for positive feedback buildup. The items never ship and you arrange a money return with the seller through different routes. Anybody heard of those groups?

I haven't seen any legit groups for that, ngl most of the listings are just scams.
You can flag them using eBay's Report a Violation tool or Amazon's Report Abuse form.