this is how it looks like a promotion of these websites, linking to the site such as Bitcointalk can positively affect the future authority of websites.
I doubt such websites ever plan to have increased their domain authority at all. What they do is registering domain every now and then and try to get one or two noobs with that domain and trap them. They never use one domain more than couple of times I think as using couple of times would mark their website as fake.