According to https://w3techs.com/technologies/details/js-jquery:

> jQuery is used by 94.5% of all the websites whose JavaScript library we know. This is 77.5% of all websites.

This appears to be current data too (Oct 2023). I'm not sure how reliable the data is, but it is congruent with my experience that _a lot_ of websites still use jQuery. It's easy to forget the HN crowd is also in a bubble. If you only read articles here, you'd think everyone is using the latest JS framework du jour, but lots of the web still runs on PHP and jQuery.