Yea that is true, there’s definitely either a profit motive or they don’t think they have the bandwidth for everyone to have multiple devices and are this introducing an up charge/scarcity to cover up that.
The site I look after we have a restriction on device numbers, 5 per room. Even that is flexible and not really enforced as in reality the network will be fine with thousands even. The main restrictions are about device behavior and preventing causing interference or outages.
There’s only 120 rooms in the site I look after so it’s not massive.
We’re running W-Fi 6 with all channels enabled including DFS channels. We’ve great coverage (roughly one access point per 4 -6 rooms in a 90s building).