Currently OneLoveIPFS is running an upload-only portal for subscribers (subsidized by me). I don't remember specifying any hosts for whitelisting on my Sia node.
I'm not too sure about what I will be running for Alive in production, as I have to consider the costs of running it on IPFS (cheaper, potentially fewer hosts) vs Skynet (more expensive, more hosts).
Best thing that can happen is that every streamer runs their own IPFS node/Skynet portal that they push their streams to, but I don't see that happening on day one.