The best win is that the County owns the last mile fiber and customers buy service that they choose. Part of the reason I prefer that has to do with issues like net-neutrality.
You are correct about the other utilities. The Feds actually built some of the infrastrucure and simply gave it to the County when they gave up running it.
You are sort of correct about the lab's backbone connection. However that connection is owned and operated by the phone company, now called Lumen. Lumen sells capacity on that link to Comcast.
The lab is not going to be interested in buying service from the County, but as a consequence of the pandemic they have said that they are interested in supporting employees working from home. Working from home with the available Internet connections is difficult.