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Is Micrio open source?
Micrio is not open source
No. Or at least not yet.
To make Micrio fully open source would not only make it more time consuming for us to maintain the codebase (read "My condolences, you're now the maintainer of a popular open source project", or Wolfram Tech's recent blogpost Why Wolfram Tech Isn't Open Source-- A Dozen Reasons), it would also diffuse the distribution since everyone could set up their own server environment.
However, we are considering making the client library open source. Once we decide about this, we will add this to our roadmap (as of writing August 2021).