What about if they doctor photos to hide a scar, or a paunch belly?Fair enough.
I've gone on plenty of dates where the girl didn't look like the pics she had or less attractive. That's a way different story than being misled with doctored pictures to hide that you're transgender. However, like BP said, there are many transgender people that you'd never know they were trans to begin with. Ultimately, I think it should be shared as a courtesy because it is a big difference that goes beyond just physical appearance.
Look, I get what you're saying. But I disagree that a trans person needs to disclose before the first date. I would say it needs to be before sex, certainly, and probably before any significant emotional attachment, although that is an unpredictable timeline.