[maxerickson]

Isn't it just a clear statement that they aren't going to give commercial users support for free?

I know you are saying it isn't clear, but your quote literally includes the statement "While the source code is freely available under the terms of the LICENSE".

[opticfluorine]

I personally think this last sentence from my quote makes it unclear:

"In short, if you use this project to generate revenue, the Open Source Maintenance Fee is required."

Perhaps I'm being too semantic, but I don't feel that is an accurate representation of the license terms involved here.

[Applejinx]

It could add 'and expect active support FROM US' and be more accurate.

I guess it's treating 'if you are generating revenue and need support you're gonna be demanding as hell' as implicit?