What am I missing here?

So this house I'm buying was built in 2017. On my first quick pass through the house I noticed all the bedrooms had an ethernet jack, as well as one directly below the tv mount in the living room. I was so excited that finally someone had enough sense to wire a home.

Upon further inspection, because they just didn't look right, they're all phone jacks. Why would anyone wire an entire house, and the tv, for telephone and not ethernet?!