Stupid way of doing SEO ? Stupid use of PBN ?

A competitor of mine has a strange link profile. SEMRush says he has 36 reffering domains from 11 IPs. Almost all of his links are from this kind of thing: (could not post the link cause I do not have 15 posts yet)

Websites that are clearly fake yet built in a way to look like being real websites, but not with too much effort put into them. And these websites have a "links" page with 20 links, one of them being his. They are even all from the same IP. For example 15 are from one IP, 5 are…

Stupid way of doing SEO ? Stupid use of PBN ?