For reference, Air Canada would need to give ~91% raise to get pilot pay back in line with where Air Canada pilots were in 2001. Post 9/11 the pilots took a terrible ‘save the company from bankruptcy’ deal, then during negotiations in 2012 the government forced a return to work deal with another terrible pilot contract.
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.