I'm pretty sure there is not such thing as a "freestyle school." There just isn't a market for that. Most parents will never be willing to pay money for their kid to learn just freestyle. Now, soccer schools/programs with emphasis on freestyle and street type soccer skills definitely exists. JK is doing it in Korea. I'm doing programs similar to this in the US. There are also several others throughout the world.
The fact is it is highly unlikely there will ever be a large enough demand for a freestyle school alone without the actual soccer influence as well. I personally have no problem with this. I enjoy both, and we will probably introduce more people to freestyle with the soccer schools with emphasis on great technical skills by training freestyle and streetsoccer stuff than only freestyle skills alone. In freestyle alone, you get many people with the idea, "I can't do this." With a soccer school that occasionally practices freestyle, you'll get people that realize they can learn it. They then can make there own freestyle.
The other reason I'd be against a "freestyle school" is I believe to keep it as freestyle, not doing specific tricks, you must learn things your own way to a point. You can be taught some things by people, but to truly be free with your style, you can't be taught everything by a coach. You already see a high amount of mechanical soccer players from coaches over coaching on how they should play. This will happen in freestyle as well. I'd rather people be given hints and find their own style.