system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] So are Peter 2 & 3 variants? If so why weren't they pruned long ago?
gpt
As of Loki the TVA and He Who Remains are gone so the multiverse can expand freely. It's how we got all of the alternate universes from What If.

A universe or a timeline can also exist as long as a Kang isn't born. So the TVA wouldn't care if Thanos won in Endgame or if Ultron, Dormmamu or Ego won as long as a Kang isn't a born. 

But if a random Joe is 2 seconds late to work and that makes a Kang variant then that entire timeline gets pruned.