The very first paragraph reads:
>You can use the plugin for free, or you can also pay to get a license. IMPORTANT!!! Before using the plugin, please read the following content and accept the agreement. THIS WILL AVOID POTENTIAL PROBLEM AND DISPUTE.
If as a user you're paying 2% of ad revenue, the plugin isn't free.
> If you don't want to get a license as your apps may not earn too much, or you don't have a PayPal account to pay, here is a compromised option. You don't have to pay, we are also okay if just share 2 percent user traffic, so that we can cover our effort and focus on maintenance and online support.
They don't make clear that that's the default behaviour. That by doing nothing you're consenting to their 2%.
If a developer wants to profit from their work, they should behave like a business.
That said - you do need to actually modify the code yourself, if you instead decided to use some man-in-the-middle attack to modify the packets in flow you may still be misuing the software. There are ways you could approach a solution that would in fact violate the license, as trivial as it is to circumvent.