I first saw it on aedn, then while examining the links of other sites, I came across a bunch of other movie sites using it too, and I literally went “whoa”.
An example page with a h4cklink:
view-source
Actually, I don’t want to write this comment, but. Anyway, there is a rise in the short term with these links. Yes, but afterwards the site gets penalized. Many people suffer from this situation; hacklinks work even if they are temporary.
After the penalty
I sold the aedn site and know the buyer personally. He always kept his distance from hacklinks. Interesting.
If you build hack links at the right time and leave them, you might not even need to do normal SEO at all. Of course, you need to be very professional for this. Professional SEOs definitely do this.