Do you have to pay monthly for Ethernet?

I'm curious to understand the cost structure of Ethernet services. Is it necessary to pay a monthly fee for Ethernet connectivity? I've heard that some providers offer flexible pricing options, but I'm not sure if this applies to Ethernet specifically. Could you elaborate on the typical billing arrangements for Ethernet, and whether or not a recurring monthly charge is typically required? Additionally, are there any upfront costs associated with establishing an Ethernet connection, such as installation fees or equipment purchases? Thank you for your assistance in clarifying this matter.