I wrote this some time ago about this very subject when Radiant v0.2 was about to release, or had just come out and still think it's relevant. People are entirely in control of their own disposable income. The moment they feel as though they are not getting their money's worth they are responsible for taking care of their own funds.Is anyone holding those people at gunpoint to continue spending their money to him? Aren't they presumably adults, responsible for their own actions (including financial ones)?
You may not agree with that, and that's fine, but it's not the creator who is at fault here.
This "dev milker bad" attitude is silly. If I post my PayPal in this post and a bunch of people give me money just because, am I to blame really?
No, it's the ones giving the money, and if they choose to do it so be it.
Not to mention it's possible that payments have been suspended for any project and this information isn't clear to non-patrons without being told. (As happens often from Braindrop, WVM's developer.)
We can say they milk as much as they want, but the truth of the matter is if people feel as though they're being milked then they will cease doing so. Thus, anyone continuing to pay feels as though the money they are putting towards they is disposable enough for them not to care, or they believe in continuing to support the creator regardless of what's coming out anymore.
That doesn't necessarily make abandoning a project right, but just because he does not continue to update it does not mean he is suddenly responsible for the patrons lack of upkeep to their own money outflow.