Like this!
Could imagine it being a good way to share knowledge/learn.
I think I would tune in to see someone else if they were covering a taxon and geography of interest. I guess the presenter would need to comment something on most IDs as they go to keep it meaningful for viewers.
Personally I would be a bit shy to present in person I think in an open public format like the Tetris link. Some Twitch streams just have voiceover though right?