I honestly cannot fathom this opinion. I literally cannot think of a single instance where I've ever seen an ad and thought "Yes, I'm glad that I'm seeing this instead of the content I came here for." If that's true, why bother even going on Instagram at all?

I'll admit that I don't use Pinterest, but from what I understand, it's main feature is being a place for user-curated image collections, yes? That's very different than algorithmically distributed, paid-for ads.