Rank Choice Voting - How It REALLY Works

So what is rack-chjoice voting? Does it really pose a danger to the US voting system?
What is happening in Colorado? Why should you care?

Video demostration on how rack-choice voting works
https://www.youtube.com/watch?v=oHRPMJmzBBw

COLORADO ELECTION MODERNIZATION RISK https://www.coloradocounts.com/