My pixel 6 is about 3 years old and the only wear I can see on it is a single little micro scratch in the top right corner of the screen that I can’t see without a light reflecting off of it. I don’t bother with a screen protector, just a thin silicon case. Battery is fine for about 2 days of normal use even though I regularly use a wireless charger.
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.