Great analysis on the ROI side of things here and appreciate all the effort you have put in.
@Quillfire couldn't have said it any better in my opinion adding that the indirect consequences of bidbots are the bulk of the story here.
I dare say your graph with dwindling user base numbers would mostly come from new users seeing how things work after diving a little deeper on the platform and checking out a week or two later.
I gave my own account of this in my 1 year review a couple of weeks back as you don't have to look very far to see how things are going on down here. Drop in market has also had an impact I'm sure but the dwindling number of active users has only increased the concentration of bid bot accounts, making it more visible than before.
It really would be ace if the trending page was a true trending page based on manual curation initiatives like the ones you mentioned and a separate section for promoted content that uses bidbots. I doubt that will happen though.
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