According to https://arstechnica.com/tech-policy...-from-charging-for-routers-they-dont-provide/
A new US law prohibits broadband and TV providers from charging "rental" fees for equipment that customers have provided themselves.
Even by the low customer-service standards of the cable and telecom industries, requiring customers to pay a monthly fee for equipment they own is pretty rude. But that's exactly what Frontier Communications does to its customers, as we wrote in July 2019. Frontier customers who use routers they own themselves must still pay Frontier $10 a month in a "Wi-Fi Router" fee, even if the router they use is fully compatible with the service and requires no additional work on Frontier's part.