system
Given the following post, respond as if you're commenting on Reddit:
human
[Endgame] When Captain America told the Hydra Agents in the elevator scene “Hail Hydra” wouldn’t that alter the events of Winter Soldier?

I’m not sure how the timeline works here. It was established that the TVA allowed this course of events to occur, but Cap saying “Hail Hydra” surely would make an alternate timeline where Hydra thinks he’s always been a Hydra agent right? But that wouldn’t make sense since the TVA maintained only 1 timeline.
gpt
The TVA *didn't* maintain only one timeline. According to them, they only pruned timelines that deviated *too far*, creating variants. Typically, they only pruned *individuals* to keep things on a reasonable course, *not* entire timelines. 

Of course, that was just a front put up by He Who Remains, and the actuality of it is that they only pruned timelines that would give rise to new versions of Kang. 

There were literally an infinite number of timelines that the TVA didn't care about. They didn't even care about there being a Crocodile version of Loki *UNTIL IT ATE THE WRONG CAT*.