An old scam still floats about
Looking for interesting twitter feeds to follow I found dozens of “flight simulator” feeds that all led to “Pro Flight Simulator.” This apparently is a classic case of “buyer beware” and surfaced around 2010. This site describes an interesting product for $49 with additional options that can total $140. But according to source #1, source #2, source #3 it is simply an old version of the free open source Flight Gear program repackaged with no change in functionality. So you can choose to pay $49 for outdated technology or $0 for something better.
A more recent spin on the scam is called VirtualPilot3D.
Many say it’s not illegal, but it’s certainly slimy. Certainly the VirtualPilot3D website is said to show copyrighted screenshots from other programs, and that is illegal.
So like anything else, do your research before you buy to make sure you’re getting value.