It's economy-driven game design that's reliant on a subsidization model to profit from it and that informs every single design decision made on the game whether people admit it to themselves or not. Developers have no incentive to be fair to their customers because it because player exploitation is more profitable. Research and development into the most efficient ways to exploit a player base on an economical and/or psychological level is becoming an industry in and of itself that's only starting to mature. I personally know several friends who have spent substantial amounts of money on these games that they didn't even like that much to begin with (my brother and myself are included in this group as well) and many of them regretted doing so after the fact. As someone who aspires to be a game developer, I find the entire foundation for F2P to be an insulting, cynical, and twisted perversion of what it means to make a game that is meant to be played and enjoyed. While there are developers who, to their credit, are as honest and fair as they can be in designing their games under the F2P model, I consider them guilty by association and refuse to support their games as much as any other of their ilk.
Is this sufficient for you? I can keep going if you like.