They tend to require specific hardware like a NVIDIA GPU. As well as having an ever evolving large model file which they will want to frequently update. Some tools certainly have had offline versions but I guess not many people are interested in setting it all up and are happy with an instant web ui

While our model is not public, there are good resources online for playing with your own images!

Like this one by fast.ai!

https://docs.fast.ai/vision.gan.html

Except that then anybody could literally just download it and start a competing service saving 2 years of development and hundreds of thousands of $ in compute costs over that time?

No, they couldn’t. And I guarantee you they spent nowhere near that sum to train the model, and that it wouldn’t take two years to clone it.

Same reason the Coca-Cola recipe is not published nor made freely available by the Coca-Cola corporation.

You just need to code up your own model architecture and then train it on your data using some established ML framework. The first step is where well-chosen priors can make a real difference wrt. your end results.