Fiber isn’t phone line. It’s fiber optic cable. It’s so far above the capabilities of cable internet.

Also, it’s not new. FiOS directly to consumers (and not just businesses) has been around for like 15 years now. Tons of providers use it. It is the backbone of every major internet provider. The faster cable speeds are often due to fiber to the node setups bringing the bottlenecks of cable internet closer to the houses. AT&T, Google, Verizon, and many others have been doing direct Fiber internet to homes for waaaaay more than 5 years, offering 1-5Gbps speeds for half the cost of cable internet.