There is more to selling software than writing it. You have market, support, and sell. Do you think their resources are well spent doing that across the gamut of software? Of course not; companies specialize.
Very similar to how cloud providers love renting servers to you to run your bank or software business; instead of running these businesses themselves.
Very similar to how cloud providers love renting servers to you to run your bank or software business; instead of running these businesses themselves.