Fast reviews for popular apps...


I'm a new developer. I'm working for a start-up and I had developed an app for them. It is in the play store for a few months. In this pandemic time, every developer face delay in reviewing time. sometimes it took a week or up to a month. But the popular apps like Facebook, Instagram and more getting quicker reviews and update is hitting the play store frequently. Why does this partiality on reviewing the app? or is reviewing being done based on popularity(number of downloads). Can anyone explain?