I expect its a combination of many things. GBAs first glade was Randolph. Tyler Ray is a very charismatic leader of the organization, quite media savvy and the media loves him. The Randolph Glades already existed to some extent, but Tyler convinced the Randolph Community Forest managing board to formalize and agreement with the fledgling GBA to make them official. This gave GBA legitimacy and regional and national media were directed at the Randolph Glades. Take a look at Tylers Linked in Profile
https://www.linkedin.com/in/tylertray/ he has leveraged GBA and into a specialty law/management firm in the Conway area. My guess is the initial success in Randolph led GBA to get its foot in the door into other conserved lands and the WMNF. Even though there have been many other glades built, Randolph seems to have become the poster child for the movement on social media.
GBA predominantly dealt with John Scarinza, a long term selectman in town and regional leader who was one of the lead participants in the creation of the community forest and acted as the lead and an advocate to the GBA agreement. In a small town there are leaders and followers, and John was definitely a leader, if he was an advocate to some effort, he had a lot of support in town. Sadly in 2023 he passed away from an extended illness. Other folks stepped in to run the community forest, but I expect there was loss of continuity between the organizations which caused a buildup of tensions by the locals with the Covid surge in backcountry skiing. The residents felt no one was listening and I expect many lost John to act as their advocate.
Another aspect is the Randolph glade is in a different microclimate than much of the other glades in the system. The Crescent range is detached from the mass of the whites by an east west valley and it tends to be a magnet for snow with far less changing to rain that seems to have become an issue elsewhere. Randolph has one of the highest populated area annual snowfall totals in the state over the long term and the Mt Crescent glade seem to get more snow and hold onto it. The problem is that "white gold" is at the end of a dead end long road that year round residents rely on. The town has 22 miles of roads to plow and that is done by one person and his priority is to the residents. Many of the homes are seasonal particularly on Randolph Hill road and during the winter it used to be quite quiet, according to those who have lived there long term, it no longer is.
Many skiers want first runs so they tend to rush to the glades even before it has stopped snowing with vehicles that are poorly equipped for deep snow. While the residents are digging out, they are having to deal with folks who are substituting forward velocity for proper equipment to get up to the parking lot. Some of the skiers are less than polite when their recreational pursuits are impeded by someone cleaning their driveway or attempting to back out of it. The lot was configured for 3 season use and not for plowing. The town has hired a local to dig the place out with his tractor as plowing would quickly eat up potential parking but he too has other priorities so by the time he gets there he has to deal with parked cars that are parked wherever they could make it to. There is potential area to substantially expand parking but I think the consensus is that will degrade the glade experience. Ultimately the solution is that less people are going to need to use this glade.
Decentralized social media also factors in, folks broadcast snow conditions and if the glade has snow when others may not, that gets wide distribution.
My guess is the original intent was that this would be one of many glades in the region used by mostly locals. It was not envisioned as something getting visited from all over New England and featured in New York media outlets. By either deliberate planning or poor luck it has become a victim of its own success. The challenge is going to be figuring out a way of managing it for far smaller daily usage and dont know if its possible under GBA. GBA has proposed many fixes and many appear to be non starters but I dont know if there is anyone in town that interested in listening at this point. Ideally controlling numbers takes management and if GBA has to start turning away folks who traveled long distances at the parking lot they are going to get a black eye quickly and they are dependent on membership dues to operate.