Not all paid advertisements or paid endorsements are labeled to that effect.
“Web Video Firm Settles With FTC,” The Wall Street Journal, September 3, 2015 B2. Some “influencers” were paid money post videos about Microsoft’s Xbox One and some games. All part of an advertising campaign. The endorsers were other influential publishers, with their own reputations.
Does it affect your opinion that someone else’s opinion has been paid for? Isn’t the provenance and objectivity of information important? How can you tell?