The OP article noted the amount needed in the village in the beginning was $22/month, so $.75 a day, give or take 10c.
You still have the problem of regional thugs that will come round every "pay day" for their taste. Or beat you up. A pretty simple variation a protection racket, but I'm not sure how to protect against it.
For an anecote on PPP vs real dollars, I remember that in the eighties in soviet-ruled Poland, an average monthly salary amounted to about $20. At the same time, the average standard of living was not that bad: most families had flats with central heating (no air-con though), education up to university level and healthcare were free, most families didn't have cars but public transport was cheap.
700m × $2 = $1.4b. What am I missing?
I wonder if this $66b is for those who are below $1/day. Looking at the plot in [1], we can guess that the number at $1/day is much lower; $66b would give 181 million people a dollar a day.
[1] https://ourworldindata.org/extreme-poverty/