I'm sorry but that's complete nonsense. Have a look at Puppet's Cloudmining 101 thread, and tell me how many cloud mining services are on that list. Now look at those I've left negative feedback for. It's blatantly obvious I'm doing nothing to stifle legitimate competition. If my feedback causes loss to services which refuse to provide any evidence of legitimacy, services which are almost certainly a ponzi like PB mining, then good. If I can also direct potential cloud mining customers from those scams to AMHash, then that's even better. That's a win-win situation for everybody but the scammers.
Also, how is Canary receiving a competitive advantage from that? He does group buys for actual physical miners but my link is for a cloud mining service. Nobody looking at my sig is going to think, "That sounds good, think I'll buy a Prisma!"
Finally, if those services want me to remove that feedback, all they have to do is provide some evidence of their legitimacy yet they flat out refuse to do so. That should make any sensible person strongly suspicious of the service being a scam, which is one of the actual valid reasons for leaving negative feedback.
On the one hand you have ASICMiner, on the other hand you have a company that nobody has ever heard of, acting incredibly shady and refusing to provide any evidence of legitimacy. Now, if you don't know who ASICMiner are (which you clearly don't), then you obviously know nothing about bitcoin mining and should do some research.