system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] what happened to the time travel technology? who is looking after it? is it still being used?
gpt
The time travel technology used by the Avengers is based on Pym Particles and traveling through the Quantum Realm.  Without Pym Particles, it's not possible to use this method to time travel, and as we know Hank Pym zealously guards his Pym Particle formula and the particles themselves.  So to answer your question, Hank is the closest thing you have to someone "looking after" their time travel technology.  

The TVA also have advanced time travel technology, as well as the ability to hop between timelines.  However, after the events of Loki and Sylvie's adventure in the Void, the TVA appears to now be under the control of a Kang variant, so he and the TVA are the ones "looking after" their time travel tech.