It would be very convenient and a huge time saver to have sex workers or people who want to profit from the app have a mandatory tag or label that makes it easier to identify and/or filter out. Sex work is work and it should not be stigmatized but there are plenty of people who are not transparent about their true intentions until much later in the conversation/interaction. If people want to advertise their services or work they should be able to do so but make it clear in their profile what their intention is from the app