Ah yes I'm actually aquintences with Jan, he's a very nice guy, but the reason Button was shut down was because he was making a series off of it and this was close to when they were putting him in the 100th episode, also I know Jan did do animation commissions as well.Journey of the Spark got 2 C&D's which they ignored and were sent a third letter, you can read that here: derpibooru.org/686351 Making something like a fanmade full length MLP movie is a threat to Hasbro themselves, it is simply not allowed. Fighting is Magic got shut down cause they were accepting payments at cons for the game and such, which if you're doing a game thats run by volunteers, the program you are making it in is free, you have all your assets, you should NOT need to ask for money, also all of these projects had their own assets that looked... How should I put this? TOO close to the show style that it could be confused for Hasbro's material itself. I also (and this is a personal belief so not fact) believe that Lauren Faust only joined Fighting is Magic or 'Thems Fightin Herd' team to simply spite Hasbro. She did not like that they wanted to change so much of her original concept of MLP that she left and had a grudge against them for a while. She hates Equestria Girls XDD and she wanted the show to end with Season 3 I believe but that was when they were all supposed to reach their final destiny's (Twilight being something special...er. to Celestia (not an alicorn) Rarity owning her boutique in Canterlot, RD becoming a Wonderbolt, etc. So the show would have been much more shorter and so many characters would have been left without backstory, their own episodes, mane 6 character growth, no EQG, etc if she was still running it and got her way. She forgot Hasbro is a toyline and MLP:FiM is to promote said toys, Hasbro is the one who simply says "we need a new princess so little girls can buy a princess pony toy" the show makes it possible, the toys are made.TL;DR: They all either made money off of it, or there's was a threat to Hasbro (show/movie, etc.)Best way to get out of it? Use OC's, change character names, locations, world name and/artstyle.