how would anyone be treated differently if the artist chose when they joined?  it can't be the having to post or be active before you can download cos again that would be the same for everyone wou'ldn't it.?

You would be extending a privelege (i.e. to record favourites) to people who post images that would be denied to those who didn't.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire