All the protocols you listed are open for adoption by various manufacturers. Apple absolutely would not be allowed to use them for a private protocol they keep to themselves. Airwaves are a public good, not private property. They even come with coverage obligations.
https://www.ofcom.org.uk/about-ofcom/latest/media/media-rele...
https://www.rcrwireless.com/20160401/opinion/worst-week-bold...
Not only that, even before Sprint acquired Nextel, Nextel was using the spectrum it had for its own proprietary wireless protocols and it wasn’t Big Government that killed either initiative - it was people exercising their own free will not buying Nextel phones and later WiMAX phones.
Most would link Sprint’s WiMAX decision back to its acquisition of Nextel Communications, which wrapped in 2005, and brought with it a significant load of 2.5 GHz spectrum licenses with specific build out dates. Nextel prior to being acquired had been testing various IP-based mobile broadband technologies, including various proprietary ones like Flash-OFDM and TDD-UMTS, as well as WiMAX and HSDPA.
For instance, Sprint had WiMAX for 4G before they had LTE, two carriers have GSM and two have CDMA. The government didn’t mandate the protocols nor did they force the carriers to use the same protocol or the phone makers to support both.
You also had the proprietary Nextel push to talk.