It's a thought experiment based on the way our current three comma overlords treat their minions. What makes you think taking that mindset into space will go any better?

And at what point do you think space travel will become a commodity to enable those colonists to form that utopia without owing one of these tyrants something big?

It doesn't take a lot of inequality to start rolling down the hill to dystopia. Play around with Markov processes and find out for yourself.