Experience on this is minimal. An astute and internet savvy branded company would have a policy covering this topic. It's smart to comply to them and I think luckily, that's what happened here. It sounds like key decision makers in the corporate office woke up and blinked. One thing not to ignore is that corporations have lawyers and will pay them to do anything, including write scary letters. Permission isn't license to do what you want, however. If I were in this situation, I think I'd lean towards paying a lawyer to write a letter fighting fire with fire.
Wonder what would happen if selling the domain URL for a good price and creating a new one would look like? I suppose the corporation could refuse permission this time.

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Rudy Hiebert,www.lubedealer.com/hiebert
www.ytbtravel.com/rxmhiebert,www.mymonavie.com/drink2betterhealth