Honestly, both sides of this conversation seem pretty obnoxious.
For example, I note that nobody is contending the facts regarding the customer onboarding and payment process. I also note that the Ghost CEO provided an ad hoc fix with no discussion on whether their policy is good. That implies there will be a next customer who faces the same situation, notwithstanding any obnoxious Twitter followup — and who knows, perhaps another ad hoc fix.
That is beyond unprofessional
But when I thought it over, I believe that industry rules will eventually catch up to your customer expectations. I would never expect a mainstream company that deals with data, such as Notion or Airbase, to replicate the same behavior as Ghost.
This is a bit different than say... Walmart talking down to a single mother who tried to use an out of date coupon.