No.

Native advertising happens on any media that is willing to take the money.

It happens with in-feed ad units of sponsored content alongside what our friends share on social networks, for example with promoted tweets on Twitter or promoted stories on Facebook, where it's relatively simple to understand what is an ad and what isn't.

These ads have proven to be a boon for Facebook, especially after organic reach was slashed. [11]

As a result, tech startups such as Outbrain and Taboola have made it possible to outsource the buying and selling of native advertising on a wide array of more traditional media websites.