system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball] [Future timeline] Isn't future trunks going to die once Majin Buu shows up? Why weren't the androids destroyed by Majin Buu?
gpt
Majin Buu required a large amount of energy to be summoned. Earth's fighting force has been eliminated.

The androids themselves don't have actual power levels, or life force to drain.

I would theorize that Babidi never brought Majin Buu to Earth because he could sense no great powers there to exploit.  Or he brought him there, saw nothing he could use to summon him, and instead went looking elsewhere.