Hey FDSGSG, the situation is definitely not ideal. DHH should not have responded like this, but please consider from his point of view: he and his company just

Hey FDSGSG, the situation is definitely not ideal. DHH should not have responded like this, but please consider from his point of view: he and his company just had a moment of existential threat with the Apple IAP rules enforcement, and the disposable addresses are the only way that they manage to be able to still put updates on the App Store. The way you approach this surely feels like another threat to his business. Especially done anonymously. If I may recommend something that has been echoed in this thread, please try to communicate to him or the company directly and discuss your concerns calmly. Directly threatening to put their whole domain as a spam domain, even with solid concerns, is not a friendly way to do it.