yea, its a bit of an odd situation and there is plenty of opportunities to get burned (badly too). The ultimate "take home" I think they are trying to sell is:
free maintenence on the EVSE for life (just like any warranty, is it justifiable)
no upfront cost (means you end up paying more over the lifetime, but we all know that)
electricity cost paid (works both ways, helps the electic companies, helps you, and somehow helps evgo)
charging stations (dc fast charging is a big boon for those who need or will utilize it regularly).
My biggest concern was that we "rent" the EVSE for three years, but if we don't change anything, thats a total of 6k over the life of the car (potentially). Thats way above a purchase. Either they will have to offer a lower price plan with the EVSE is "paid" after the 3 years or something else to couteract the cost. 3 years for their $49 for the EVSE is ~$1750, if they are basing this off AV's product and installation (which they use their product and installation), and standard EVSE with installation from AV is ~$2,200. With evgo you get the more advanaced unit. Plus with the tax credit (30% = ~$600), that puts the total evgo is getting about what they unit would be through AV (if they are even elligable for it - dunno how it works since its not at their offices).
We shall see how things go in 3 years. Hopefully the model will change. Or, maybe other companies that had "free" charging, etc. change their model to this? (eww). Only time will tell