So, let's say, a kickstarter for Al Qadim (that would go after to dmsguild) from a known company is not very likely? I overestimate the market value of a historical setting with faithful supporters?
Kickstarters typically work with the premise "Give me your money and if enough people give me their money I will give them X, Y and Z." For RPG products typically one of the things backer's get is the product they are funding. DM's Guild material cannot be disseminated outside of the DM's Guild. I doubt very much someone can say "Give me money on this third party website and I will give you a $0 version of the backed content on DM's Guild." So for a kickstarter to be successful for DM's Guild content, what is a kickstarter going to reward it's backers with?
Patreon on the other hand works differently. Many (though not all of course) patreons are a case of "I'm producing this content. If you give me money I will be able to produce more of it/make it better quality/continue doing this indefinitely because you're now paying my weekly rent." It can be used to fund DM's Guild content is, so long as the person puts it up on DM's Guild for free (or at least free for a certain period of time). Now
all members of the public benefit from the discounted content on DM's Guild, but that's often okay (look at Dyson's Maps), because Patreon can be used as little more than a tip jar.