Terraforming other planets would be astronomically more challenging than fixing our own planet and we don’t seem to be able to get our shit together to do that. Even if we are capable of terraforming other planets, it would take many centuries at minimum. O’Neal cylinders are far more likely to work once we start industrializing the moon.

And the more times you do it, it’s like playing a Russian roulette over and over again, you’ll eventually be caught.

Having to keep creating fake identities to prevent people and governments from finding out that you’re immortal. That would be a massive pain in the butt, especially in a world where mass surveillance of the population is common.