The Charity Button Shouldn't Replace The Subscription Button.
I am not in the closed beta of the new charity feature so I am going by what I have seen in Twitter posts and streams so far.
From what I gathered when a charity stream is active, the subscription button is replaced by a donate type button for the charity. I do not mind this at all BUT I would love to see the donate button AND subscription button be both present on a channel.
I asked this because some people doing charities use subs as a goal for different gimmicks for the stream as well as donation goals and some use subscribing during a charity as a way to "tip" the streamer outside their normal "tip" method to help with the streams upkeep and just cost as a streamer.
I feel like being able to donate to a cause AND sub to the streamer to show support would be awesome!
Just my thought as a bystander.

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FREAK_115 commented
I completly agree with this, intentionally or not, this might prevent smaller streamers to suggest to gift money on their streams to charity.
Smaller streamers would make just a bit more then what they need to come round from streamers or as a part-time job, a lot of streamer who don't earn a lot like the top streamers who might earn 500-1000 dollars/euro's more monhtly cannot risk losing part of their monthly income from twitch if they want to support charity while the big streamers would barely notice a difference
In order to stimulate small streamers to also add a charity option, this improves their stream, this improves the amount of money gathered amongst all streams to fund to charity while at the same time growing their own channels without losing a part of their already unstable monthly income