There is no dofollow attribute
Standard links are followed by default. Attributes such as nofollow, sponsored and ugc qualify the relationship for search engines.
Paid links
Google recommends qualifying advertising or paid placements with rel="sponsored" or nofollow. A paid ranking-oriented link left to pass ranking credit can fall under link-spam policy.
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View BuyPBNBacklinks.net PackagesPolicy reference: Google Search spam policies. Google states that buying or selling links for ranking purposes is link spam; sponsored or advertising links should be appropriately qualified.