I might add one perspective to the whole topic, this is not from my experience (as I'm not a trans person), since I have an FL account (no, I won't share it here 😃 ) I've been approached on that platform by a few interesting people. One of them was a trans woman, on hormones, but pre-op.
She was wearing a small, intentionally smaller than needed, cage for quite some years as she was born with naturally feminine beauty, and wearing the cage helped her maintain her appearance - she wanted to look and act as per the gender she felt she was, and her body and face helped, except for the genitals. So the cage kept her "flat", especially when she wore dresses or skirts.
The thing is, she liked the squeezing feeling and the state the cage kept her in if for some reason she was not able to unlock it. This, and the fact she didn't want to use this part for sex, she stopped unlocking herself and threw away the keys. Yes I know I panicked myself when I heard it, turns out she already had experience with wearing it for over a month at a time and thought that if needed it wouldn't be a problem to remove the toy, yet, the lack of keys would make sure she can't act "rashly" 😉
When I met her, it was three years since she got rid of the keys (at least that's what she told me), a 24-year-old with a transition process underway, but pre-op. I have video-chatted with her, let's say the effects of hormone therapy were quite visible 😉