The question is currently in the Hot Network Questions list (HNQ). Each question asked on Stack Exchange has a set of "arbitrary hotness points" at any given time that depends on the number of votes and answers (and votes on those answers). The ones with the largest numbers of hotness points are on the list for as long as they remain "hot", and are displayed on the sidebar on all Stack Exchange sites.
Worldbuilding tends to get a lot of these questions, because they're often clickbait without meaning to be clickbait. Plus, they often attract loads of answers, which in turn means higher hotness scores.
The HNQ is controversial, in part because it often showcases questions that aren't representative of the best content of the site they're asked on. However, they also garner activity and visitors to the site, which is especially nice for smaller sites. At the end of the day, the HNQ has benefits and detractions.