Hi, thanks for your interest! You can opt out of telemetry if you like. Please see the FAQ here: https://docs.modular.com/mojo/faq.html#does-the-mojo-sdk-col...

For open sourcing, we also have a section in our FAQ: https://docs.modular.com/mojo/faq.html#open-source, and we answered a question about that in the latest livestream! https://www.youtube.com/watch?v=mQh9es5gfpo

For the question on pricing, the Mojo SDK is free to use.

Disclaimer: I work for Modular