To survey people anonymously is not typically a path to business success. Asking for opinions without knowing the source and background of those giving the answer could have decision makers who are not in touch going down a dead end.
This is definitely true when asking for opinions about how to improve a product or service or asking opinions about which is better and what are the preferences.
The answer risks accuracy unless more is known about the context in which the answer is shared. Who has the expertise to answer and who is simply blowing smoke?