It has no advantages over my design afaics and a DAG can't do instant transactions (as in < 1 second) and can't prevent the money from shrinking to 0 asymptotically.
Do you hint that you found a way to do instant transactions? Does it use quantum cryptography?
Nothing that exotic. But yes afaics I can do them with some mild caveats in a block chain design. By instant, I mean as fast as server can receive, sign, and propagate a transaction.
The key breakthrough was realizing the users can control the unprofitable PoW, same as in your design (but hey I had that idea since 2014 I just didn't put it all together until recently). So a little bit of centralization is actually still decentralization, because the users can move at any time. I suppose a DAG can be similar. I just fear the crazy complexity of attack modes and selection rules in a DAG. I prefer something easier to analyze.