James D. wrote:
My prediction is that your moderated group will initially attract a few
like-minded Hams, but will ultimately suffer from disinterest and boredom
and fade into oblivion within a year at most.

The qrz.com groups, including the Q&A group, is moderated.
They have been pretty successful. There are presently 108
topics in the Q&A section many with 30+ replies.
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73, Cecil http://www.w5dxp.com