[graemep]

The idea is that you can accept donations to cover the costs, but not beyond that.

So an organisation can pay developers to work on it, cover hosting costs etc. but they have to be careful not to accept donations for more than that. A non-profit can accept more provided it is used for the right objects.

I have no idea (neither does the author of the article) where that leaves an individual developer who accepts donations to cover the value of their time.