Making a snap decision about a person based on a 1/2 second assertion.
Of course, looks matter. We make such 'snap decisions' all day long. The problem is, absent anything else, that's the entire decision. In the real world, personality goes a much longer way than the 1000 words in a photo.
At least most online dating apps try to develop and communicate a sense of who you are, which in some cases, they do very well.
What would those be? Whether they find the potential date attractive in the first place?
Remember, a picture is worth a thousand words.