Hidden fee, or just higher charges… charging rates for non-tesla vehicles appear to be somewhere between 20-30% higher depending on location and time of day, peak non-peak, etc. There doesn’t appear to be some PER USE charge, like $1 + kw use fees.. but a non-tesla user can also PAY a monthly charge of $12.99 monthly, and pay the TESLA VEHICLE kw rate instead of the additional premium per kw charge.
for a non-tesla driver, the monthly fee seems to most likely pay off IF one is going to charge ~ 70-80 kw (1-1.5 80% charges a month) kw per month or MORE, of course again depending on location, time of day, etc.
Personally, I think the 12.99 charge is a teaser rate and it will move to $19.99 a month within ~ 90 days. For someone who wants reliable charging, nearly ubiquitous, high uptime, FAST chargers at market rates, the 12.99$ a month is a no brainer.