You mean the bit about pirated software? Nope. Just a classic feeder line Apple gives to developers as a scare tactic. 30% is likely a heck of a lot more than what a canned c&d letter costs to get a pirated app removed from a trusted/authenticated app store variant.

Truth is Apple doesn't want competition for their large cut of "advertising/distribution" revenue.

If I develop an app for my existing customers and I want to support their device (Apple in this case) I have to agree to give Apple a 30% cut. Apple wouldn't have provided any direct service here for an unlisted app. I'm willing to host it and provide any merchant and billing support for it. I told my customer how to install my app. Apple's App Store wouldn't be providing any "distribution" services as it were (which as I understand is where historically the 30% rate originated --for that they should be paying for all my hosting and logistics).

I want to pay $100/year for Apple to verify my identity and make sure I'm not malware. That's all. In this universe I really don't even have an interest in using their closed-source compiler, or have to keep up with their programming language, but I do it cause it makes the numbers work.