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Why so? Should resources not be allocated to the platform that brings in the most value in terms of users and engagement?

Because there will be reward disagreements. I don't like going into it, but I feel that if it's more than just 1/2 threads a day, they might come knocking.

Agreed. But how about having a $ Leo-specific curation account? Threads get substantial Leo vote from an account with little hive power.
They earn Leo (not hive)

That would work