What is the zero fee limit on Coinbase one?

Excuse me, could you clarify for me what exactly the zero fee limit on Coinbase One entails? I'm interested in understanding the specifics of this feature, such as whether it applies to all transactions or just certain types, and if there are any conditions or restrictions that come with it. Additionally, I'd like to know if this is a permanent offering or if it's subject to change in the future. Thank you for your assistance in explaining this aspect of Coinbase One.