Honestly I'm (selfishly) kind of glad that they're shutting down, as awful as that is. I browse Reddit a lot and the fact that every single time somebody posted a product, there would always be a PriceZombie bot commenting bugged me to no end.
I've found that very helpful. Otherwise, I feel like I'm gambling when I buy something on Amazon. I could be getting the lowest price, or the highest. Amazon's price games are the worst (I know all stores do that to some extent, but Amazon's price swings are much bigger.. +-75% anecdotally)
Yeah, I guess I'd rather search myself if I'm actually considering buying a product. And most of the time, if I'm participating somewhere, I'm not actually looking for purchase advice myself, just reading, helping out, or discussing.
The robot can ignore individuals if requested. Additionally the robot only posts in subreddits where the moderators have granted the bot permission to post. Thus it doesn't post anywhere where it isn't wanted. Your situation is best resolved by adding the bot to your ignore, since you don't want to see it at all.
Yeah, it's an RES feature. I never noticed that actually because I keep most features of RES turned off, including Tagging, which I believe that is under, after searching for what you said.