Very timely, I just came across this account doing this exact thing if you want to see it in action.

https://www.reddit.com/user/Clear-Car862/

If you inspect their comment history, they are recommending several products in almost every reply. ContractsCounsel is one of the services they recommend. The formula they use for recommending is very similar for every post.

Also interesting, one of their only actual posts mentions the phenomenon of using bots to advertise, I guess trying to throw people off their trail?