Why is Coinbase charging me a monthly fee?

Excuse me, could you please clarify why Coinbase is imposing a monthly fee on me? I've been using their platform for some time now and I've never encountered such a charge before. Is this a new policy or is there a specific reason why I'm being charged? Could you also elaborate on the details of this fee and if there's a way to avoid it? I would greatly appreciate your help in understanding this matter.