Is this feature a good idea?
I think most people would be using it almost exclusively for uploading content from other sites. People who are doing that would be violating the terms of service of those sites by sharing copyrighted content with SLR without permission. By having this feature SLR would essentially be encouraging people to infringe the copyright of other sites while expecting everyone to respect the copyright of SLR's own content.
SLR could also be at risk of being sued for unauthorized commercial use of copyrighted content and if SLR re-encodes the content for streaming that could be creating unauthorized derivative works too.