I have only ever been on one Game online, it was Farmville and I played it on Facebook, though there are other ways. I was very hooked on it more than fourteen years ago, and played it for two years, when I had no idea FB had a forum section!
As a Game farmer, I was nearly a millionaire on virtual money, then found they were talking real pounds and dollars when my virtual wealth increased. No way would I commit to that, and reluctantly I closed my farm and found the Friends forum in 2007 and built friendship instead of stock and dwellings.
I have not heard anyone ever mention Farmville which is owned by Zinga Zinga (I think that is the name) and Googling shows it is still thriving.
I have heard how children ran up huge debts on childrens games online when their parents had no idea of it happening. This could so easily be done, a while ago. As a senior citizen child, I won't even do banking online!!