Let's be clear.
BIM Streamer is not another BIM Portal.
BIM Streamer vs BIM Portals
BIMStreamer is often considered as a BIM portal / BIM marketplace where many manufacturers can upload their own product portfolio. BIM portals are some sort of Amazon or eBay for BIM Objects.
It is important to note that BIMStreamer is not a BIM portal but a software / tool for content management.
BELOW TABLE EXPLAINS KEY DIFFERENCES