I am not a techie by any means but we do get around a lot. My feeling is that the "FREE" WiFi has improved in the last 5 years as more and more campers use and demand it.
We had a favorite campground that had sporadic at best OTA TV reception and the county decided to "improve", read as RUINED, everything. The first problem they had was letting their bean counters decide what system to use. Not enough bandwidth and everyone streaming movies. This seems to be the problems most everywhere.
Money controls the quality of the WiFi but as I said it is steadily improving everywhere.