Yikes.

So the bigger question then is what happens when they change this? Or go away. Also, have you seen what "Additionally, different hard limits apply for each plan." means on their pricing page[1]? Domain limits, maximum files, etc? What those might mean when you scale beyond expectation?

I don't mean to discourage. But big vendors pull the rug out from under people all the time, sometimes ruining a business because there's no viable alternative.

Make sure your eggs can be put in different baskets if need be.

[1] https://vercel.com/docs/v2/platform/limits

Yeah, that's almost worse. It means Sitesauce is relying on the generosity of their vendor for their business model to work.

Well they could also connect to upload to s3, netlify, github pages, GitLab pages, to name the free or pretty cheap static hosts I can think of!