This seems like a solvable problem. Ignore elements that have display: none, visibility: hidden, or opacity: 0. Do fuzzy text matching if you must. If you know

This seems like a solvable problem. Ignore elements that have display: none, visibility: hidden, or opacity: 0. Do fuzzy text matching if you must. If you know that they'll never put just "Sponsored" on the real ads, ignore anytime you find that string.