I would pay a fee for unbranded pages for certain usages! I hope this is part of the form customization that comes out.
We are definitely considering white labeling as a feature, though I believe at the moment our plans are to limit this feature to enterprise plans.
You said that you would pay a fee for certain usages—could you elaborate a little more on how and when you would like to use unbranded pages? Seems like you would want them for forms—would you be sending out these forms to clients, for internal use, or something else? Would you also want unbranded embeds or shared table links?