I agree with this, some of the games named above are clearly not "scams" and crowdfunding isn't inherently bad, however I do think it could do with some regulation.
Patreon's design for example is extraordinarily anti-consumer, it's essentially hand crafted to support scams and they have no incentive to change whilst they're earning their cut risk free. They make individual due diligence impossible, don't do any due diligence themselves, let devs manage their pages so they can remove negative comments/old posts, don't have any enforced requirements regarding roadmaps and product descriptions, there's no review functionality, they fight refunds tooth and nail etc.
Sooner or later there will probably be a massive project that causes this to come to a head and regulators will clamp down on it but it won't be over porn games. It'll probably get worse moving forward too as it becomes easier to put together impressive looking demos in UE5, even for those who lack the ability to follow through.