Why am I being charged a monthly maintenance fee?

I'm curious to understand why I'm being charged a monthly maintenance fee for my cryptocurrency account. Could you please elaborate on the reasons behind this fee and what it covers? Is it a standard practice in the industry, or is it specific to your platform? Additionally, are there any ways to avoid or reduce this fee, such as maintaining a certain balance or engaging in frequent trading activity? I'd appreciate any clarification you can provide on this matter.