> But still don't like "undisclosed" black box enterprise pricing though when they're running their own API, because it basically means they can tax you to death if you build a service that competes with their API right - so in effect only viable to create small companies with this tech?

"undisclosed" doesn't imply changing the price after it was negotiated with you. It just mean they will negotiate the contracts for large projects, without disclosing the terms to the public ... in my view.