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Presumably because they assume it will cost less to maintain Python 2 than porting the application to Python 3. The Calibre author said something like that him

• tutfbhuf 7y ago
  "I am perfectly capable of maintaining python 2 myself. Far less work than migrating the entire calibre codebase. status wontfix" Porting to Python 3 has been done many times even for very large codebases. I think if a application is written in a way that to fork Python 2 and support that indefinitely instead of upgrading to Python 3, is the lesser evil of the two, then I would come up with serious questions about the quality of the codebase and its maintainers.
• mindcrime 7y ago
  Presumably because they assume it will cost less to maintain Python 2 than porting the application to Python 3. That strikes me as incredibly hard to believe, but hey, if they've "run the numbers" and that's their conclusion, then so be it.