Anomandaris,
@Anomandaris@kbin.social avatar

I think there are two reasons:

  1. Tumblr isn't nearly as popular as it was 8 or 10 years ago
  2. Tumblr isn't, generally speaking, a well known site for the kinds of tech focused people that would be building such applications. Tumblr has a focus more towards sharing images (even to the extent of screenshotting twitter posts rather than linking the post itself), and generally speaking (again) more tech focused people tend to prefer sites with more generic content, such as lemmy/kbin/reddit where you can have images, links, and text discussions.
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