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UA is iteratively calculated for all accounts based on the follow connections between all accounts. The UA of an account increases when it is followed by other accounts with a high UA. UA is independent from reputation and steem power.

I don't understand. Is it the amount of followers you have? Is it being followed by popular bloggers? What is the algorithm they use? Do they have a whitepaper?

Sorry if I ask a lot of questions but the whole thing confuses me as it's not explained how it works.

You can find more information here:
https://steemit.com/steemdev/@cryptoctopus/user-authority-a-better-reputation-system-with-interesting-applications

Sorry, the project is in a very early beta stage :).

I’m also unsure, though in whatever case, IMO, spamming users about it isn’t the most professional way to go about promoting it...