Today is a day to honor those whose lives were lost due to anti-transgender violence. The fact that many transgender and gender-nonconforming people are forced to turn to sex work to survive makes them particularly vulnerable to trafficking, assault, and other tragedies.
The reason you can’t take a picture of slavery today is because it is dependent on the narrative. If you don’t know why someone is working, you will not be able to know if they’re enslaved or not.