Earlier quoted context omitted.
There are only two questions everyone have: 1. Would Netlify forgive the bill if this didn't go viral? 2. How do you plan to address this issue so that it never happens again? Everyone here knew someone from Netlify would come and say OP wouldn't have to pay. That was a given. Now we want to know the important answers.
1. Yes. We've forgiven lots and lots of bills over the last 9 years and they haven't gone viral 2. While I've always favored erring towards keeping people's sites up we are currently working on changing the default behavior to never let free sites incur overages
Sequence of events doesn't support this answer:
1. User gets charged 100k
2. User complains to support
3. User receives discount to 20k, then 5k. Support states policy is normally 20k
4. User discloses to the world. Goes viral.
5. Invoice is forgiven
While you might forgive "lots and lots", fact is that you still presented the invoice to a free tier customer, and when they complained you gave them a discount, but still charge. Only when it went viral did you forgive it.