The context
1 year ago, after a Master's degree I had my first real web developer job in a great startup (~50 people) along two other juniors, we all were trained and were given a lot of resources (time to work on side projects, daily meetings & any resource we asked for) which I am very grateful for.
I always have been pretty autonomous but thanks to them I'm a much better developer.
For ~8 months we were all in remote.
The problem
Today they want all of us to go back onsite which I don't find necessary, my question is: would be it very unethical for me to leave/threaten to leave right now for full remote?
The details
They basically trained me and now that I'm a bit productive I'm threatening them to leave if they don't offer something full remote, in my mind it seems very unfair but objectively I know I can find a full remote job, it would make my life so much easier but I would lose a great environment. Also I live far from my workplace and I already asked my manager for that, but he didn't offer any solution.