I've noticed this too as well, I find this decision to be extremely greedy. Considering that you've added already so many micro transactions to your game which are besides quite expensive for some cosmetics, I'm really questioning your plans for the future. Twitch is a great way to expand your fanbase and to get in touch with your community, unfortunately you put a paywall behind your past broadcasts and for what ? Dealing up with some "fees" ? What a joke.
Just to compare : Klei, another indie game studio which has more than the double of your overall followers on twitch never resticted their past broadcasts behind a paywall ever. What a strange way to treat your community with such a greedy attitude. Coming from such a small studio like yours, it's quite heartbreaking. I'm sure you guys could find other more honorable ways to ask for some support.