This might come as a long shot but long a go I contacted our delivery service for food, I asked them the same question to add a donation button where the hungry got fed.

Their at 800 thousand food deliveries to the poor and mal fed now, can't you add a donation button that appears once you have subscribed to some a channel that donates FOOD to unicef (with the condition of food for 3d world countries) and magic will shine and heaven will welcome you with open arms so will the publicity for twitch sky rocket. It won't cost you anything.
The delivery service I vouched for is only in Sweden imagine what the whole earth will do, you can bock it down to like a plate of food to a week of food so like 2-10 bucks a donation.
Great idea tons of mouths will get fed and the world will be a better place. Make sure it's the worst places too so it truly makes a difference.

A meal would land on what 2 bucks or well a bit more than that they probably get 10 bucks is a week of food for someone for what a day of coding and setting up a webpage and making contact heck lets say 7 on a stretch including waiting time and setting up terms and conditions.

You can prime advertising of food for starving places or create your own and just donate the bulk to Unicef with the condition of feeding the poor and poverty struck countries, well most likely Africa and other places around the world.

What's the 10 bucks or 2 bucks while accessing the sub page, most people will most likely bite (just as I told the delivery guys) at some points and chip in. Twitch has done wonders too the world but I feel this will likely tip the company too a new age where it supports the people that most likely will never access the internet or at least not for a foreseeable age of 50 - 100 years in to the future.

Please take this too hearth and make a BIG difference just like the delivery company did back in the past, their rival Uber Foods does not have a donation button and it's world array. Hey and heck you might know him maybe you can parse that it's a decent idea too add it as you waiting for your food in the app to add a donation button for food for starving people in the world. But please make this little button the prime focus of your next day, it WILL make a difference. So the little kid in Africa also gets a chance like you did well or fighting chance to ever achieve something in her / his life.

Best of regards Christian.