Is fyber.com Safe?

They didn't fix the problem with the offer i accepted which was to Install and open the app. I proved that I installed and opened the app and it was not registering as complete. They did not fix why it was not registering as complete before the offer timed out and they simply said too bad. Another one i accepted and installed from their offer disappeared from their offer list and never appeared in the status list for accepted offers. Again despite reporting the problem straight away they never fixed it so i could make progress on the offer before it expired. If you try any games where they offer rewards like game gems powered by fyber don't bother you won't be able to get the rewards and because you have installed the games you won't be able to get rewards in other games powered by another system since most offers are for new players only.