Understanding Active Users on Lemmy: What Defines an Active User?

Lemmy.world has quickly gathered 22,000 users within just two weeks of its launch. However, only 6,000 users are considered active on a monthly basis. This raises an intriguing question: what criteria must a user meet to be classified as an active user? Is it a certain frequency of engagement, specific actions taken within the platform, or perhaps a combination of factors?