Write into the user agreement that everyone scrolls past that the user agrees to take hormones and to put their heart and soul into fully transitioning as soon as possible and then pour the rest of your resources into your legal department to make the gamers understand that they signed a legally binding contract and are going to have to live up to their promise if they ever want to be seen as adults.
You are correct of course, but if someone sat us down and explained to us what we had actually agreed to after we clicked past one of those user agreements I'm pretty sure it would be very different from a forced transition but not all that much better morally.