I think part of it was that Apple was taking 30% from donations, tips, and e-cash gifts that wechat itself wasn't profiting off of, and I don't think those were

I think part of it was that Apple was taking 30% from donations, tips, and e-cash gifts that wechat itself wasn't profiting off of, and I don't think those were even powered by in-app purchases. Also, Apple itself accepts wechat as a payments method, so it's a payment processor.