My only issue with the example is that people are not cooperative enough to share one savings account and bitcoin doesn’t require you to cooperate with anyone. Otherwise it’s an interesting concept.
Discussion
Well it does though. If I'm running the only node, the whole protocol would be at risk. Bitcoin merges self interest with the common good. Not to mention how much you and I benefit it ubiquity and wealth from new plebs. Though again you could argue the merits of self interest or others. It's chicken or egg conversation.
Definitely holes in the idea but they're fun to poke.