Companies that link to their other brands in their own footers or in their main navigation to switch between stores.
If you’re an authority and a blogger has a list of resources and other reading in their sidebar.
When you’re producing a ton of photo content and the website uses your work across numerous posts.
As you do something newsworthy and media companies, bloggers, and publications mention, source or feature you for it.
Providing databases and feeds to sell products on other sites that link to your site.
Having bloggers or publishers create a store without “sponsored” or “nofollow” attributes on their links.
Banner ads – run of site, category, etc., because they are paid placements.
Widgets, feeds, and badges with keyword-rich backlinks.
Widgets, feeds, and badges that are clearly marketing ploys and not something exclusive or real.
If the site is part of a PBN (private blog network) regardless if you paid or earned the links.
Using scholarships and other gimmicks.
Leaving comments on blogs, in forums, or on community websites.
Keyword-rich links to category pages or products that you do not manufacture.