For many people, online dating is a means to an end. A person wants to, say, end up in a long-term relationship. So, he or she goes on a site like Match or OkCupid or Coffee Meets Bagel, dates any number of people, truly connects with one, and decides to cancel his or her account, ultimately. Success! (Of course, some people don't want a long-term relationship, which is also a valid choice.)
Then, there are other people who send messages day-in-and-day out trying to see just how many dates they can line up. They know that if Monday's date doesn't work out, then Tuesday's and Wednesday's are right around the corner.