Great job and initiative! Gmelius Founder here. A few questions:
i) Are you planning to make the whole implementation Open Source?
ii) Say I wish to adopt and use your SDK in my current Gmail/Inbox extensions (>100K daily users), may I expect the implementation of a fixed upper limit on the number of transmissions in the coming months (which could endanger the reliability of my service for my users)?
iii) While the SDK currently only focuses on the UI, are you planning to add more "complex" interactions, such as Gmail filters/Gmail preferences ? If yes, feel free to get in touch. I will be happy to help.
Congrats, again.