IMO this isn't necessarily bad (it's one way to get data), but the numbers are meaningless without a control. Unfortunately, I think we missed that bus by ~20 years. Had the same study been conducted every few years over the last two decades, I think it would have been valuable. Maybe it is still valuable to do this once every few years? (I think that everyone in 2026 is maximally addicted to mobile phones, but maybe I'm wrong and it can get worse).