Again - This isn't about DPC. It's about the Patreon system.
If one isn't interested in my opinion on Patreon and how it doesn't incentivize developers working at a quick pace, do not read the following I put in spoilers:
If I buy a car, there are consumer laws protecting me in case I buy a lemon ("lemon" here in the States is slang for a bad car). I can get my money back.
If I put my money in a bank, it's insured by the government up to a certain dollar amount.
Why do laws and insurance like this exist? Because nobody is expected to blindly trust car manufacturers or banks (just two examples out of many I could mention).
So why should the expectation be different for some developer out there I've never met before?
I don't "trust" any developers. I see what they produce and if I like it, I'll pay for it. If I don't, I won't. And there's no guarantee any developer will finish a project - for a wide variety of reasons, some within their control some out of their control.