Snap advertisers are mostly lifestyle brands that want to engage with their users in a new way. Tacobell isn't advertising on Snap, but Popular Mechanics is. When a user clicks on Popular Mechanics they have confidence it's because a user wants to engage with them, and Popular Mechanics hopes this closer relationship has benefits outside of the Snapchat app. A user choosing to give you their attention is a _very_ valuable thing. Most other social media advertisements are missing this part.