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Objective, non-emotional answer: Where will past users of Craigslist personals now go? Probably OkCupid or Bumble. I think that these two platforms have very much established themselves as data-based, efficient modes of matching. As they have gained popularity over the past few years, I think that they have cut into Craigslist’s market share - since Craigslist is essentially just a newsgroup that doesn’t offer a whole lot of functionality. Accordingly, I don’t think that this closure will displace a lot of folks.
Due to this, the people at Grindr decided to bridge this gap and help people with a bit more exotic sexual preferences. Another big issue could be safety and privacy, as people with different sexual orientations may be under threat in some environments and this app can help them get in touch with each-other without facing any risks involved in public dating.