Paid Link building in SEO vs contextual link ads

How to explicitly diffrenciate between paid link building for SEO made to manipute page rank & contextual link ads. As many blogging authorities run contextual link ads. If xyz sites get link from contextual link ad, how can Google determine is it for SEO terms or Ads related link? and to penalize or not

How can I run the same on my site telling Google that it is for ad purpose not paid link building for SEO

submitted by /u/Virtualsure
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