There's a lot of crossover, but marketing is not exactly the same as PR. What they have sounds like bad PR. Unfortunately, bad PR can also be great marketing.
For the record, I'm all for Patreon. I have way many more examples of it being done right than it being done wrong. I don't think it's Patreon's fault, and it's not the fault of the funding model either (a model that has existing for munch longer than Patreon has). Like all technology, it gets misused. It's not the technology's fault.
When people think an artist crosses the line they have the option to stop supporting them. If more artists who create better quality art and have a better business ethic start to emerge and get on Patreon, then I think the type of predatory practices you've talked about will start to become less of an issue. Consumers will have more options and can put their money elsewhere. But if they are starving for something specific, whether it's art or video games, they will put their money towards crappy art and shady developers because to the hungry soul, every bitter thing tastes sweet. So if you want to really fix the source of the problem, support and help promote artists who are the type of artists you want creating content, and/or become one of those types of artists yourself.
A few of my favorite creatives can now do what they love full-time without being at the mercy of ad revenue or their work schedule. My opinion? Patreon kicks ass.