I find this list fascinating, because it seems counterintuitive. I expected to find generally lower illiteracy in countries with simpler/fewer languages, but Romance languages (Italian, Spanish) top the list, while countries with multiple official languages (Switzerland, Canada) are in the middle, and at the bottom are countries with multiple languages and which are generally thought to be difficult to learn (Danish, Finnish). That seems almost backwards.
What I get from this is that when it comes to success in language learning, technical difficulty is mere rounding error compared to other factors.
More likely is that Netflix realized most people, including myself, aren't on Netflix to consume text content.
In fact, the text is more likely to spoil the show. "A space freighter has to take refuge on a desolate planet. Little does its crew know that their temporary shelter is infested with horrific parasites. But you do!"
I might as well be picking my next viewing from a selection of pictures and illustrations.