

Before an instance does something malicious, how do you know it will be malicious?
Even if everyone there running it, & participating is pure of heart, how can you be assured that haXXors won’t simply break in to take advantage of that trust you’ve given them?
Banning bad instances is a reactive stance that only applies after damage has been done. Can you convince the corporate overlords to take that risk? And it only increases as the fediverse gets more popular, and more instances get trusted.

You’re not wrong in this context.
If ambient temperature was say…21 C, then it’d take no energy to keep things that cold.
So in space, once you do cool something down enough, and place it far from any stars, it’ll stay cold for free.