They have here but doesn't give a clear reason.
How can I buy Swype? / When will Swype be on the Android market?
We have considered a direct-download sales model, but there are two challenges to that approach:
- Customer Support - Providing Swype users with the level of professional support they deserve is a priority for us. We're still a small (but quickly growing!) company, and we don't have the resources necessary to support a full end-user sales model. It is much more efficient for us to focus on improving Swype and to partner with large organizations like Samsung and T-Mobile who already have customer support structures in place.
- Device integration - Swype isn't just an app; it's a keyboard - the most widely used piece of software on a device. It interacts with nearly every single application on the phone. As such, it's more like a system component than an application. For each device release we do a tremendous amount of testing and we always find issues due to the varying components - the OS version, the device hardware, the OEM UI implementation, etc. In addition, some features can't be implemented without an OEM's engineering assistance. We end up doing a large amount of work on each device to be sure that you have a great experience entering text using Swype. So, we appreciate your enthusiasm, but we are not ready to do direct-downloads at this time.