https://c.tenor.com/EFessAhMy4sAAAAM/yeah-so.gif

Active meaning they have a balance or active based on recent activity?

Strategy is the only real Bitcoin buyer.

ETFs, Strategy and Lightning

Is this just btc main net or it includes lighting and other l2 aswell?

How is active address defined?

Define active. Do you mean “trading”? HODLrs are cold stored, exchanges are experiencing a dearth, and the ₿ circular economy continues apace.