There are many virtual keyboards built into OSes, and many OSes, even in use by the general public. There is a very extreme difference between the ability to c

There are many virtual keyboards built into OSes, and many OSes, even in use by the general public. There is a very extreme difference between the ability to choose an iPhone, and being able to choose which wires are on the pole in front of your house. Common carriers are required to provide service under a special set of terms, in exchange for special and preferential treatment, like having exclusive access to public resources. That's not the case with a mobile phone, virtual keyboard, or OS. If you want to make one, go make one.