this is very futuristic or even kind of sci-fi like scenario, COOL!
you've got my upvote (was a bit too late to resteem).
I like reading your thoughtful and well written posts.
please do continue to share your stuff!

for example, this part:

What about ways to earn the coins? At the gym, if one is riding the exercise bike,
AFIT can be paid for watching ads at different interval

reminds of the 2nd Episode of "Black Mirror" series, called "Fifteen Million Merits".

However may be it is a bit too ... idealistic. :)

taking into consideration the fact that now here on SteemIt automated upvotes are mostly (or only) being used to increase the revenues, compared to "manual curation". in other words, the main goal is Profit: such upvotes are what is called "content indifferent". unlike the scenario you describe here, with marketing companies' Ads content being "auto-upvoted" by other companies, I suppose retailers, which would not be so indifferent, but rather very much concerned about both the Content published (which is in itself a Product, even though digital / intangible) AND the especially the merchandise advertised in those articles (which is tangible). so, it would unlikely be kind of HYIP style model "auto-upvoting" focused only on how to EARN MORE from the upvoting (curation) process.

here though, it is different a lot, well, at least now. (although would it ever change?) the only Product is so called "Content" - which is actually NOT the main interest of majority of those who use "auto-upvotes" (or has no any interest at all). besides, many of those who do it are aware of that fact and thus do not bother to publish actually Good Quality Content - but merely just some pretense of it, i.e. posting just for the sake of posting, to keep up the flow of this so called daily "Product" - only as a means of EARNING from that process and maximizing profits. perhaps it can be compared to some factories in China or elsewhere (third world countries) which pop up (or more like "poop up" LOL) some cheap junk stuff, just to keep "Production Line" busy and flood the whole market, ALREADY Over-Saturated with that junk, with yet more junk. :D

this present state of affairs (aka "Ecosystem") is more like about exploiting the flaws and loopholes in the System by the masses of mostly Profit-minded (not quality of content minded) people - who actually can't be blamed for that (and in fact nothing wrong with pursuing more profits).

so, IMO people are not yet ready for that Futuristic scenario: most are somewhat (or a lot) too HYIP-minded. and the whole System actually facilitates and encourages that.

but yeah, the Future you've described is bright and shiny! :)