OSMF pays Cloud68 to maintain that video system. I’m here main point of contact on this, so you’re in luck with this message! 
I agree that this “auto account” feature would be useful. The software behind the site is BigBlueButton. I don’t know if it can support account creation via OSM OAuth. I fear it might not. However, I’ve asked C68, and I’ll get back to you if it’s possible
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