it's not as easy as it sounds. The hosting on Twitch wasn't just for videos but for the chat logs synced to that video as well. So you can't just download the videos and upload them somewhere else you have to download them using Twitch's shitty tools so that you get the chat as well.
That takes a lot of time but they only got about a month to do that. And that assumes that one actually has the time, energy, access and expertise to download the stuff. What about disabled streamers? What about families of deceased streamers? They now have a month to figure all this stuff out if they even receive the news at all.
That is mainly an issue caused by the fact that the whole chat synchronization thing never got developed into an open format since everyone who cared about it was just fine with companies using their own proprietary format for it.