They wanted to use the hearing aids feature that Apple recently released but it is not available in India. They found a way to get around the geo restrictions and enable it.

Rithwik Jayasimha immediately went out with his dad to buy a pair for his grandma. “We came back home, we took them out of the case, and I was looking for the feature and it was just missing,”

I believe AirPods are the only earphones with a hearing aid feature so far, and because of how expensive hearing aids are, they are probably the cheapest.