I think with Twitch it's not really necessary. The community itself is generally, with exceptions, not toxic (being curated by streamers).
The 'who made this and why' seems to indicate some minor antagonism for the platform financials. Their take on bits transactions is definitely abhorrent, but they haven't blocked 3rd party transactions yet. People know they are getting screwed when they buy bits, but they have other options.
I hated bits when they came out, but they fill a bit of a niche role that a streamlabs/paypal donation doesn't. If the end goal is to shift money from viewer to streamer, bits smooths a few obstacles.
Once a bits purchase is made, they can be spent on any streamer instead of repeating the transaction for every person. The actual tip itself is an almost frictionless transaction, just a few keystrokes in the chatbox. This avoids the bounce rates seen when a user has to open a separate browser window, possibly log into paypal, or providing information to a third party site, etc. Most streamers I've discussed this with privately have said that they agree on the rates, but that it's still been a net benefit (sorry, this is just anecdotal). The worry of course is that it's a precursor to complete control of transactions (eg, banning paypal/streamlabs/etc) despite claims this won't occur.
But all of that aside.. I think the project would get a lot more traction if you at least appeared to try to work WITH the platform instead of against it.
There's a lot of value you can add here just to augment the system instead of combating it. Help the streamer build their online profile. Some thoughts:
* Keep the in-line stream, embedded with the Twitch chat if possible.
* Build a CMS system for the streamer to showcase custom content while he or she is offline.
* Add a merch store or integration.
* Embed the streamer's twitter feed.
* Show off their Discord.
* Keep the forum.
* Add a tool to sync up community permissions across various tools (twitch permission, discord, steam groups, etc).
* Show off their YouTube content.
* Add a calendar
* Show when the streamer's friends are online and streaming.
* Make all of this modular so streamers can pick-and-choose
* Optional WYSIWYG style edits (I know, but.. it makes this more accessible to users)
There's a lot more. Some of the above may be bad ideas, and I'm certain some are not for every streamer (and I don't think should just turn on all-of-the-things if they did exist).
I love the idea of giving streamers a way to build further upon their Twitch audience. It could increase engagement and help Twitch. It could also help reduce a streamer's dependency on a single platform, eventually, without outright confronting that platform.