Some users look for ways to circumnavigate nagware. This involves the use of “crack codes” to hack into the security features of the program and fool it into believing payment has been made. (EasyTechJunkie)

For example, nagware is mostly used with a shareware where only one trial version is proposed and once this is finished, the program must remind the user to buy it in order to use it indefinitely . Therefore, all of this consists of a reminder that annoys users in order to' buy a special program or product. (informatique mania)

This is a form of nagware and ransomware that can even infect your mobile phone and not leverage any vulnerabilities or even execute any local code. Unless you are tech-savvy enough to delete calendars and unsubscribe to internet calendars yourself, the perceived problem is that your expensive mobile phone got infected! (SecureWorld )