The Stream team was following the SharePoint storage allocation model - and although I am guessing the new SPO model is as much a surprise to the Stream team too it made me wonder if the plan will be to continue to follow it. (Especially with the Teams Cloud-Based-Recording promising to chew up so much space).
best response confirmed by
Adrian Hyde (Steel Contributor)
Sorry. No plans right now to change stream storage quota to match SharePoint. That could change in the future, but we aren't planning on changes right now.