https://paxful.com/buy/bitcoin/madagascar
How many more hoops do you then have to jump through to acquire fake stocks?
Second, you then have to make sure you avoid pyramid schemes (like OneCoin), rug pulls, exit scams, bad exchanges and bad "smart" contracts (like the Parity bug).
This is not easy even for highly informed tech workers in the Global North. Now if you happen to speak another language (as I do) I recommend you go and Google "how to invest in Defi" or whatever in it. In my case (French), you get just articles after articles that are sponsored content from very dubious sounding wallet and exchanges, especially if you add "Madagascar" or "Congo" or whatever to your search.
So frankly, I think the idea that "crypto markets are great for the Global South" is more of a convenient story.