I really think you didn't do anything interesting in this post. This is because you need to authenticate to log in via OTP, and from that point on (with your IP and everything else) the system knows that it released this data specifically for you.

Even if you had managed to log in without authenticating, all users know that by uploading images there, they become public. It's worth noting that the coordinates of each user were not sent to you in the response, only those of users who are relatively close.

In short... using a dating app means knowing that you are in a public environment, just like going to a shopping mall, party, park...