Yes the ads on many sites now are annoying. The price for a "free" internet.
I have been playing STOL (Star Trek Online) for a while on and off. Not Playing everyday and less than AH. If you are a fan of Star Trek it's fun and I have played it totally free. While most of these free games limit you unless you buy premium stuff I've found STOL has depth to it even in free play. They are tempting me to buy some stuff though and I see how they make money.
There are ways in STOL to earn dilithium ore by mining for it but the real money comes from what they call "ZEN" for better weapons ,ships, and crew abilities.
You can customize your ship, design a character, Hire and train crew, fight in first person shooter, join or form a fleet, and Ship to ship battles against AI or other players.
I am Tlumin Captain of the Federation Cruiser Vonkar