To add some more data points, I just returned from a roadtrip where I drove my Bolt bit over 1000 miles.
Most of my CCS DC FCing was on free BTC Fatboy chargers listed at
New Electric Vehicle Fast Chargers Now Available Along State Highways in Central California | Caltrans along highway 99. I've never used nor seen any of those Caltrans DC FCs before this road trip. I also charged on a ChargePoint CPE 200 at
PlugShare - Find Electric Vehicle Charging Locations Near You (ended up being free) + EA ABB chargers in two different locations (used one of those locations before and the other, never visited before) + EA BTC Power (never been to that location before).
At one location w/ABB, as I walked into the Walmart to use its restroom, I stumbled across Bolt driver mucking w/the the credit card reader and having problems. I told them don't use it. They suck and EA knows they're a problem. They had no idea and they then noticed their CC reader said network error. Ha! After I had them use the app, charging tried to start then failed immediately, even though I was helping them support the handle. They were like.... that's ok, we figured we'd charge since we got here.
When I came out, I noticed the above Bolt occupants weren't around and they left the car plugged in w/the failed session. It was past 10 minutes so it's possible they got hit w/EA's idle fees. I unplugged them to stop the idle fees (if they started) but was in a hurry to leave so I wasn't able to leave a note. I had over 250 miles of driving left.
At one EA site (with 8+ chargers), I noticed the lone unit w/a CHAdeMO handle was stuck booting on a text screen (for Linux?). And, the unit I was using had major touchscreen lag and the hardware buttons under the softkeys on the screen didn't really help. I gave up in stopping the session via the screen/hardware buttons and pressed stop on my Bolt's infotainment system.
Although there were definitely some broken Caltrans chargers (and reports of them on Plugshare), I was always able to charge my Bolt fine at each of the sites I went to.