Iite health monitor

I got two of the free lite health monitors…

1 of them does not work in one of my cars, the other I have had to remove. as it was causing issues with the ecu by showing up problems (which are not there), causing it to run in limp mode, the final thing was that I could not get into the car using the remote (has a good battery), 3 hours later I could!

Got to ask why are they free?