It doesn’t seem to me like Wrapped requires a terribly large amount of development work every year. There’s a new design each year, but they probably just reuse all the SQL queries with the year swapped out. After the first year, it probably only requires bugfixing and regular maintenance. I bet a few devs keep an eye on it as part of their other duties.

Unlike YouTube Rewind, which requires a writing team, a production crew, talent, and music, on top of the analytics.