What about releasing it like how Node.js was released? that is a full web platform but one which uses Python instead of Javascript? and with a repository for packages which people can download and use or even contribute to?
Ultimately unless there is an active and vibrant ecosystem, there is very little reason to consider your platform - especially when there are alternatives like Node.js, Django etc.
Also, for me I will be concerned about how I will integrate Anvil with third-party libraries needed for things like reporting, authentication/authorization, E-commerce etc.
Sure, the GUI wizard is not there for Django but what if someone were to develop such a wizard for Django? or what if someone were to say that it is best to stick with Django / Vaadin/Ketura/.NET/Go/Rocket.rs even if it takes another 25% more time to develop in because the ecosystem is much bigger and we can predict with more confidence that Django / Vaadin/Ketura/.NET/Go/Rocket.rs is going to be around?
HOWEVER, if your product was available open source, is a lot easier to setup and use than Django/Ketura/... (you could provide it as a docker image) and you had a business model where you provide hosting for that solution (similar to Heroku) and/or paid support, you may end up making more money because a lot more people would use your platform - lot more than your current model which very few companies will risk purchasing.