UTOPIA in Utah is an example of a network that is pretty close to what you propose. The city installs all the last mile fiber and leases the lines to private I

UTOPIA in Utah is an example of a network that is pretty close to what you propose. The city installs all the last mile fiber and leases the lines to private ISPs. They have ~10 ISPs to choose from, and you can get 10 Gbps connections. My city is placing a similar proposal on the ballot this November (https://connectkaysville.com/ https://connectkaysville.com/).