For those of you worried about patent filings in poor countries, here's a bit of an anecdote.
I'm the inventor of a technology that resulted in a product that captured 99% of the market worldwide and sales of over a billion dollars a year. Did it while working for a large multinational, so didn't get but a couple thousand dollars as a bonus.
When deciding where to patent, the decision was US, Europe, Japan, and a couple other countries. BRICS weren't even a consideration. It costs a crap-ton of money to file patents, and even billion dollar products cut cost if it can.
The logic is that you don't have to block every possible market. Just the big ones. They will ignore the small markets as if they had patents.