They make so much money licensing 'free to play' moneysucking games that every account is a potential income. They don't care about the free accounts, they know they will derive an income from them, somewhere, somehow. Even if its just advertising revenue for the constant stream of clickbait. Gambling games in particular, such as about a million (obvious exaggeration) varieties of slots, where you can buy more coins if the 'free' allotment isn't enough for you, are massive money spinners from gambling addicts. Even with no chance of any tangible return, they'll keep spending. They no longer have a problem monetising the site as they once did. They have found their source.