There are competing products with support for installing apps from outside the platform-vendor-run marketplace. There is no law anywhere requiring any class of

There are competing products with support for installing apps from outside the platform-vendor-run marketplace. There is no law anywhere requiring any class of device to fit some definition of a general-purpose computer. It's through market demand and questionable contract negotiation on IBM's part that general-purpose computers were successful, not any kind of government regulation.