I was in the "other" forum and all of a sudden I get a pop up for a product called Flight Simulator Plus. Now, I liketo sleep, but where did this come from. I haven't heard a word about it till now. How about anyone else?

A paid version of the free Flight Gear program.

Facebook runs add for this all the time. Of course, neither the ads nor the website mention that all they've done is package what's freely available to anyone under the name of FlightGear. I've wondered for some time why the FlightGear developers don't sue the living crap out of these rip-off artists.

Because it's perfectly legal as to what they are doing under the license agreement.