For now we've focused on making the product production-ready on AWS, so that we can get users to try it out. Once the model has been proven we'll likely branch out to other clouds.
However, if you really can't wait to run Neon on Azure, you could contribute the integration yourself: the code is available under Apache 2 at https://github.com/neondatabase/neon/
Exact reason why I asked :) Thanks for the response & all the work you're putting in, it looks really promising.
I noticed you mention Azure BS in your RFCs as a potential backend. Have you done much work towards that yet?