Both Google and Apple invest heavily in development tools for their respective platforms. These tools may not be as accessible to end users as BASIC, but that is because these tools support much more than basic math and graphics. Android also has a number of development tools that are vastly easier for end users to use (and, from my meager understanding, the same is true for modern iOS).

The reason why you don't see this advertised for mobile devices is for much the same reason that you don't see programmability advertised for modern computers: it is a feature that only appeals to a tiny subset of the market. The reason why you see programmability advertised in a calculator is due to its utility for the target market (e.g. programming is often introduced in math class).