As a policy I don’t answer the phone with an unknown number from any area code except my work HQ, I don’t answer the door for anyone that looks like they are paid to be there, I don’t open mail if there’s any hint it might be a mass mailer. At the end of the day, no matter what methodology they use, they are always going to get a bias from people who are willing to participate and be contactable.
I couldn’t read the menu but I ordered what I think was spicy chicken stir fry. Was good, would order random things from the Chinese menu again.