That charge is for cases where a company with at least 25 developers wants to include this as a component in their own apps.

It's a pretty normal and reasonable charge for that kind of scenario, in which the company licensing it would likely be charging/earning vastly more than this from their clients or end-users.

There's a charge if you want to use the image editor in your own app. You're buying a library, and if your organization has more than 20 developers working on implementing it $2k is peanuts.

Nope, not for the online image editor, you can edit as many images as you like.