I'm not following the logic here. There are tons of free tier AI products available. That makes the world more fair for people in very poor countries not less.
Lots of models are free, and useful even, but the best ones are not.
I'm not sure how much RAM is on the average smartphone owned by someone earning $5/day*, but it's absolutely not going to be the half a terabyte needed for the larger models whose weights you can just download.
It will change, but I don't know how fast.
* I kinda expect that to be around the threshold where they will actually have a smartphone, even though the number of smartphones in the world is greater than the number of people