I post a listing on Craigslist specifically saying it's not "ok for others to contact me about other services, products or commercial interests" (an option in Craigslist) and then a business tries to convince me to use their site using a disguise DESPITE clearly stating that I don't want to be contacted?
No, I'd say the true test of whether something is ethical or not is whether it violates rules and/or the choices of a user. Then again, I'm the type that actually wants businesses to respect my decision.