What is the protocol fee for Immutable?

Could you please clarify for me what the protocol fee is specifically for Immutable? I'm interested in understanding how much it costs to utilize the platform and if there are any associated costs or fees that users need to be aware of when interacting with the Immutable network. Additionally, is this fee subject to change, and if so, what factors might influence any potential changes? Thank you for your time and assistance in helping me better understand the costs associated with using Immutable.