I've never handled a project like this, but I feel like the goal should be to meet what average demand will be once the high demand of the first few days goes down. No one is going to remember that they couldn't login to Disney+ on the first day as long as the experience on the second and going forward is strong.
Plus, its free press. "Disney+ so popular at launch it was hard to get into for a couple hours." Meanwhile, as people are getting home from work and reading that headline, and Disney+ now works.
OK - so if it is so obvious that you can't scale from 0 to 100 on launch day, why not anticipate that?
I imagine the gigantic Arctic cold front passing over the East Coast right now created a much larger demand than they were expecting on a non-holiday Tuesday morning while school is (supposed to be) in session.
