I like to consider people who take tropes or inspirations from other mediums or genres are also OG, no bashing on our trope-gang that runs around here but y'all are cool. I think the writing contests bring out the best writers in the guild also.
Absolutely. Tropes or cliches don't automatically disqualify a Roleplay from the premise of "originality". I'm more or less of the mindset that they tend to be less popular because many of them run in the same vein. I feel that it's a lack of variety that tends to be the issue. Or, rather, why they seem to be less popular.
Are their original twists in some of these plots? Of course! The Entertainers was one that I saw while perusing that takes a few cliches and twists them in a way that is entirely unique. They exist, but I've also seen quite a few Roleplays that were literally a cliche or trope and that was the entire premise (admittedly most of these were in Free, but still).