It's not "I can't take ideas" so much as it's "I can't take ideas from people who don't have connections." According to "anonymous sources", his parents are well established in Hollywood.

I'm sure if Terry Pratchett went on Twitter and tweeted her "I got this great idea for ponies," she'd be all over it.

"Hi there! Well, after doing some research on the inner workings of Hasbro, I found out that an old, old friend of my patents' was the Senior Director of the company. They hadn't seem each other in years & wanted to hook up. I asked if I could send her a few premises I had written for MLP & she said, sure! A month went by & we didn't hear anything…then we were astonished when she gave us a call & said, you've got a shot! Looking back, 2 years ago, my writing wasn't amazing…Meghan helped me every step of the way. It was a wonderful experience & now, I'm focusing on a novel. I still watch the show & have no doubt that season 4 will be epic!"

From the user himself. Again, not just going on twitter and solicitating.