stumble upon

This isn’t a piece you stumble upon by accident.

It was not difficult for students to stumble upon examples of mislabelling.

While we stumble upon Find a Grave for different reasons, we end up finding out there’s more to it than just pictures.

Under the rules, the finder has to show that they correctly solved the enigmas and did not just stumble upon the owl by chance.

Is it because the more raw volume you have, the more traffic is likely to stumble upon your site, and that generates ad revenue?