My 2cents worth on why your growth has been linear and not exponential is based on the timeframe of your data. Basically the entire time covered with your data has seen a decline in steem's price. From what I can gather, a lot of activity on steem has dropped with the price. Many have drifted away as the price has dropped.

Your content is unique and your results are untainted as you say by the vote buying and other tactics many here (myself included) use to boost growth. Your content is excellent, but it is very niche. With less people active here, that is less potential voters for your content.

Long story short, I think that the compounding and inflation effects that should lead you to exponential growth have been negated by a declining audience (not related the quality of content, just less eyeballs to actually find and vote on it)

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