I guess that it makes sense, producing the clickbait equivalent for taste (you watch it and think "oh that looks mouthwatering") but I don't recall ever watching these and thinking they look healthy.
EDIT: To clarify, I am specifically referring to adding a lot more sugar, salt and fat than we need; I do realise a lot of these recipes use vegetables, have plenty of fibres and essential nutrients, and so on, but hyperprocessed foods that lack those qualities is a different kind of unhealthy than what I'm talking about.
For the record, I never actively look online for recipes on any of these sites, so maybe that is also the reason I only see these recipes.