What I didn't understand about this though was the demo was like "Oh I've already got funds in my magic unicorn lighting non conformance wallet" which sounded a lot like he just waved away all the complexity which is actually buying bitcoin with cash and withdrawing it.

The process was like "I send $10 of btc here, and it turns up here" but not "I deposited $72 bucks into my account to purchase btc through strike here, which bought $65 worht of bitcoin, which was worth $120 by the time I opened the twitter app and sent the $10 worth of btc, which was worth $9.80 when it arrived and then the guy who received it in his wallet went to withdraw in USD at one of the new cash points by which point the currency had fluctuated again and it was worth $5"