I have encountered waiting @ Barstow (while it only had four slots last July), Hawthorne (again last July before the latest expansion), Mount Shasta and Fremont (before its latest expansion) in CA.
Certainly TMC Connect 14 brought a lot pf people out and onto the road, so that shaded a couple of them, but not Barstow and Hawthorne.
I have also encountered waiting @ Las Vegas, NV, Bellmead (Waco, Elon's Texas visit), Lone Tree and Grant's Pass.
Mind you, I am NOT complaining.
I have done the alternate charging method at multiple RV Parks, and Supercharging wins hands down.
Regarding "free for life".
Probably until the first 5 EV million cars or so are on the road, then it may be re-assessed.
But by then, a lot of PV panels and battery back-ups will also be in place @ Supercharging stations, so the economics will be adjusted accordingly.