1, 2. Interesting, kudos to them they created an instrument for miners and holders to liquidate crypto. Do you understand that such payment processors drive prices down? They acquire relatively illiquid holdings, then market sell them (BTX>BTX>USD or other real currency).
3. Nice, gambling is a great niche for crypto - censorship resistance, fast and cheap transactions, ability to validate payment history. I like it. "Gambler's vision"

4. Nice, as long the discount is legit and worth the hassle. Games4Coins admin, if you are reading this, consider adding popular MMO games.