No I'd say they opened up a platform for people that want to give their well performing code to the masses, and they would love everyone to continue to do so.
Go ahead and ask for donations, but please keep these requests to your website. Our platform isn't here to be your advertising venue.
Go ahead and make add ons that do anything you want, as long as it is within the confines of our own licensing. Also, please keep the code readable to human eyes so we can make sure it's not behaving badly and negatively impacting our end users game performance.
I thought it said asking for donations wasn't allowed, but can't you still just say something like "XXX add on is developed full time by XXX person. Please visit our website if you think this is an add on that should continue to be developed in the future."