Congrats on your launch here on HN. This does seem like a nice niche market to tackle. I think you're positioned well in the market for multiple reasons.
I'd be worried about Netflix if they saw you're growing fast, but until then I doubt they'd be a threat. If they were courageous enough to do this they would have already, so most likely they're waiting for a player like you to prove that there is a large enough market for this before they pull the trigger. And I think by that time you should be large enough that it'd be just easier for them to acquire you instead.
Second, if you build out your platform in a way that can be generalized it could be worth even more. The platform should be content agnostic so that it can be used for other underserved populations down the road.
I'd be worried about Netflix if they saw you're growing fast, but until then I doubt they'd be a threat. If they were courageous enough to do this they would have already, so most likely they're waiting for a player like you to prove that there is a large enough market for this before they pull the trigger. And I think by that time you should be large enough that it'd be just easier for them to acquire you instead.
Second, if you build out your platform in a way that can be generalized it could be worth even more. The platform should be content agnostic so that it can be used for other underserved populations down the road.
Sweet idea and good luck!