If I were in the US, and particularly in one of the seriously intolerant red states, there's no way I'd want and of my details in their database.
I don't think it's catastrophising to consider there may well be very real risks to being openly trans in the US in the near future. Risks of not only blackhat 4chan hackers, but also from government and legal system attacks on sites like this.
There's nothing new about this, sad though it is. People, particularly insecure people, have tried to suppress minorities since the dawn of time, and they're constantly inventing new ways to do it.