Put another way, sure I can wait 6 hours or so until a sightling happens to be around so I can read a letter, but how is me paying a few bucks for someone's time to do it now any different than you paying for Uber, Lyft, etc. instead of taking a bus?

Further, while I support this initiative, I have to wonder how sustainable it will be in the long run. I used to occasionally use Solona, a CAPTCHA-solving service that relied on volunteers. Unfortunately I can't seem to find it anymore (only searched briefly) and I recall many instances where volunteers weren't available. A marketplace that exchanges micropayments for these types of services, usable on a variety of platforms and with easy notifications for assistants, is something I've personally wanted for a very long time.

Disclosure: I'm working on such a thing, hoping to launch in 2-3 months.