There is also a fear factor involved with an antivirus program, without one installed, a person could have their PC infected with malware. Antivirus is usually the main service used because just about everyone has that on their PC. These fake subscription scams are prevalent.
They want you to click the link or call to contact “McAfee” or another company they’re pretending to be so they can roll out the next phase of their scam. Emotions tend to get us to react without stopping to think first, and this is what phishing scammers are going for. Your first inclination is to get upset because it looks like you’ve been charged for something unexpectedly and without your knowledge. Especially if you don’t use that service or if you’ve turned off the auto-renew feature.
It can be confusing when you receive an email from McAfee, Norton, or another subscription service saying your subscription just renewed.