First can be sidestepped by not mentioning the trademarks of the platform holder anywhere.
The second can be side stepped through reverse engineering.
Third can eventually be hacked out of the device (like the recent encryption key reveal on Intel CPU's) and was not applicable to older generations.
Proof of 1 and 2 is the existence of new games developed for ancient consoles.
https://www.syfy.com/syfywire/the-unlikely-but-very-real-res...
“Most console games have to be signed with a secret key designed by the console maker or the game will not load on the console. There are several methods to get unsigned code to execute which include software exploits, the use of a modchip, a technique known as the swap trick or running a softmod.”
I don’t see how iOS is different here.
I did not know about that one but I did know of AppValey and others that work based on enterprise certificates. I am not sure what prevents Epic from using this method to create an alternative store or why Apple does not claim that if you want you can have alternative stores on iOS therefore there is no antithrust issue.
Of course AppValey and the like require installing a root certificate.
Also, none of this allows you to unlock the bootloader.