Thread:Elledy92/@comment-26838855-20190425183005/@comment-2106279-20190722183744

Danniesen wrote: Yes, because Hitler has then seen you. Ergo, that's a change. But time does not change by you simply being there if you have not been seen. According to the MCU it does. The MCU's time travel goes out of its way to explain that it doesn't work like you think it does; it doesn't abide by the rules & logic other mediums use.

In Avengers: Endgame the alternate timeline 2012 Loki took the Tesseract & escaped. He never went back to Asgard, so in that specific timeline, there's a lot of change as Loki would not be present for Thor: The Dark World stuff nor was he there to exile Odin & usurp him.

Kevin Feige confirmed at SDCC that the Loki TV series would be about the alternate timeline 2012 Loki, but that it would take place after 2023, after the events of Endgame.

To sum it up: in the MCU, when you time travel, regardless of whether you did anything or not, just by being someplace you weren't originally, you have now created an alternate timeline, and whatever happens in this timeline will not affect the timeline you came from or any other timelines.