The difference here is that the ISP is up charging for multiple devices, meaning this isn’t all being done for benevolent reasons.
The way many apartments work for non-students is each has its own WiFi. Honestly compared to how bad some Hall’s WiFi is this is a better option, but it’s not without problems. A lot of ISP routers either don’t support or don’t turn on by default DFS channels, 5.8GHz channels, 6 GHz band, or have WiFi 6 for BSS colouring. This means there will be loads of interference between adjacent WiFi networks.
It’s really frustrating especially when you have ISPs like Virgin whose kit has DFS support, but despite touting smart wifi they just never enable it, and most people don’t know to enable it either.