This is farcical on the face of it. There is no situation where the "hoi polloi" are going to be building colonies. This is a creation of science fiction with no basis on reality. You need fundamentally significant amounts of money to leave the planet. We're talking hundreds of thousands per person. Some rich person is not going to ship off people who are unwilling or don't want to go..
[1] https://en.wikipedia.org/wiki/Slavery_in_the_United_States
However, if you are willing to regress the definition of slave to a 19th century understanding: are you being paid a wage to sell your time to build an Elysium for someone else?, do you have to wake up at a certain hour to go to work?, do you have to eat/urinate/defecate at certain hours provided by your work environment?, do you have to sleep at a certain hour to prepare for work? You, me, we are the slaves already, only the whip is different. But if you own over $30 million, it's fine, you are on the internet, nobody knows you are a dog here.
[1] https://www.archives.gov/milestone-documents/13th-amendment
Our species has proven again and again it's inability to care for the extended tree of life, heck, we still believe there are sharp and crisp delimitations between our own species (the blacks, the Jews, etc.). Why then this gaslighting about "we must save civilization"? Just because some of the billionaires, those who our system lets to own the world, are scared of dying? Hey, rich guy [2], got news for you: we don't have a civilization, we are barely a bunch of pseudo-evolved tribes, infighting for trivial resources and perceived boundaries.
Let's figure out how to have a civilization, then, maybe, we can try to save it.
However, as it stands, "we must save civilization" is doublespeak for "you, hoi polloi, go and build an Elysium for me and my friends", just as the Qataris said to the slaves to build them stadiums [3]. And if you own less than $30 million [4], don't kid yourself, you are still hoi polloi.
[1] https://reliefweb.int/report/world/humanitarian-organisation...
[2] There are no rich gals https://www.investopedia.com/articles/investing/012715/5-ric...
[3] https://www.amnesty.org/en/latest/campaigns/2016/03/qatar-wo...
[4] https://en.wikipedia.org/wiki/Ultra_high-net-worth_individua...