BioSehnsucht
Model 3 LR
Oh, it absolutely is.
To directly answer your questions:
1. Depends on your definition of fast charge. AFAIK there'll be one CHAdeMO at each site, and a mix of 50, 150, and 350 kW CCS. So, if a car has CHAdeMO or CCS, it should be able to charge it. However, many cars won't be able to take the station's full power.
2. Who knows about maintenance... cost to charge, as I understand, is meant to be comparable to gasoline costs, which is much higher than Supercharging.
3. Considering that this is a compliance charging network, I have to think none.
Based on #2 I think it would be funny if Tesla started posting their charging costs like gas stations do outside of some well placed Superchargers, so that other EV drivers get jealous of the pricing.