quality captcha is outsourced to humans.

Great!! then, that.. would provide humongous free advertising & promotion for the Steem token and the Steem blockchain. And definitely, would means that new flourishing faucet based Start-ups & bizniz models would start growing up everywhere like worms all over the internet to earn easy Steem. (same as when the beginnings of bitcoin)

What undoubtedly would attract a bunch of hungry people out there who can't or are unable to write a single phrase as to save their asses, but even so, would contribute to sky-rocketing the popularity and demand of our precious Steem/SBD/SP holdings.

Well, ¡Yeah! at least these new exclusive pauper captcha eaters and prolly also illiterate actors interacting with the Steem blockchain in this way, would be Actual Human Beings milking humbly the system to be able to eat & fill their bellies and not Dumb/Blind/Greedy bot rapists fattenning the already obese asses of the greasy owners of the bots. }:)

plus, having to solve a captcha for every upvote would be a huge burden to place on users.

¿Burden?, Ha! only for those Lazy Asses sort of users who are not willing to READ or aren't interested on consume good content and/or also refuse to Consciously Work for their rewards.

^{I mean, I think I've already talked too much. I better shut up now and I start working immediately in the programming and creation of a brand new Steem Faucet Website..... :p}