The internet is part of it. Most trans-identified people are not very likeable. They don't really have real life friends, a lot of them don't have regular employment, and the real world does not validate their delusions. As such, they spend a lot of time online, which means trans-identified people are overrepresented on all forms of social media. This is why you can go for years never even seeing a troon in the real world, yet they appear to be everywhere online.

They are also extremely loud about their troonery, and behave in a generally anti-social manner typical of people who are suffering pornography addiction and internet addiction (addicts are generally more neurotic, less agreeable, and less conscientious than non-addicts). Non-troons are more likely to simply click the X at the top right of the screen than to carry out an argument with a terminally online fantasist, the downside of which is that there is no real resistance to troons taking over LGB spaces (and all other spaces) and making it all about troon inclusion (i.e. enabling).

Since the internet is now where most people get their information, troon overrepresentation in every online space makes it seem like there are way more troons than actually exist, and that their views carry more clout than they otherwise would. This becomes a self-fulfilling prophecy as it informs people's ideas about the world, becomes the basis of policy, etc.