I've been using Okcupid on and off since 2015. Interestingly, I've seen the same girls on it since I started. Girls that aren't bad-looking, in fact I would say some are pretty. They made genuine attempts at improving their profiles over the years, taking better photos, writing less generic descriptions, etc, but it seems like they've gotten little to no dates from it.
Perhaps they are actually getting messages from guys but just haven't committed to many dates, but I'm starting to think that it's not as easy as you guys think it is for a girl to get a boyfriend/hookup. The most attractive girls on the site would be gone after a couple of weeks, implying that those girls had found partners quickly and had no use for the site after that.