Worrying that a cis person might take cross-sex hormones long term by mistake is like worrying that your child will go out and roll in the nettles if you let them in the garden. Sure. Hypothetically they might roll in the nettles. What they’re not very likely to do is go out there and roll in the nettles a second time. Meanwhile trans people are yelling to be let out of the nettle patch while being told that moving around the garden is dangerous and to stay put for our own safety.