Absolutely a bad idea. Got a call from my grandparents (whom I installed a license for) because they thought they got a virus on their laptop due to this popup. Send a newsletter/email, don't give ominous, un-opt-out-able popups to drive blog traffic. I genuinely wonder who thought pushing what is essentially an ad to premium subscribers and end-users was a good idea. If it continues to happen and there is no way to disable it, I'll just switch products to something more respecting of their paying customers and who their customers provide end-user support to.