Nothing happened. A month or two later, I decided this was a waste of time. But before closing the remaining browser tabs (which were the ones low on my priority list), I decided to submit a one-sentence description to the remaining sites.
The next morning, I heard back from one of the sites [1], which not only wanted to feature my startup [2] — they also wanted to license our technology to make their website easier to read!
If there's a lesson to be learned from this N=1, it's that shorter is sweeter when it comes to pitches.