I assumed that app is more "top" within its category mostly based on installs (quantity and velocity) and user rates and comments. Probably also slightly some other criteria like android vitals score etc.
However, I spotted the app that is #9 in Top for parents with 1.9 average rate (sic!) from 177 users, and only 10k+ installs. All other apps in this top10 are like 100k installs and 4.8 rate.
The question is how is it possible?