Your policy just causes you to avoid the poorly done astroturfing, it does nothing to actually avoid it.
What you should do instead is mentally "filter out" the results of the astroturfing, and evaluate the service on how it looks minus that.
Maybe I'm going to have a hard time, sure. But "be the change you want to see in the world" and all that. In the past, my objections have prevented one company from engaging in marketing spam, and made a third party dump their SEO provider because of shady practices. I'll continue doing as much as I can, and I encourage others to do the same.
You are missing my point - I'm not saying it's fine. I'm saying you are missing your target.