thats not how the world works,
GLWIZ service COST the company money (bandwidth / infrastructure) , one must be STUPID to think they would just do this for "free" all those "FREE" apps you see, they are either after market-share to get popular and then be acquired, (similar to Whatsapp, YouTube etc.) or they are supported by ads.
GLWIZ has a decent market-share, so i don't think they are after that, I have a feeling they have a deal with Samsung that Samsung pays them something for each download ? All I can tell u, there nothing FREE in this world, someone , somewhere is paying for it