bspus, what do you mean by scale? If this is an increase in capitalization, then I can not predict anything. As for the scalability in terms of the number of simultaneously running servers, this should be checked. It is desirable that there are at least a few tens of nodes in the testnet, which would be periodically switched off. If we are talking about the number of transactions being processed per second, then theoretically it is not limited, it all depends on the capacity of the servers and the network bandwidth.
As for the other DAG, I learned about the IOTA after I started writing the cheatcoin.) It seem that DAG is the direction of development.
I mean in terms of anyone getting a full node up and running easily.
I must admit first of all, I have little understanding of how DAGs really work, so maybe I have some misconceptions by comparing in my mind with blockchain systems.
We all know about bitcoin and eth's scalability problems in terms of transactions, total space requirements etc. The only reason other coins don't have these problems yet is because they are not used as much.
IOTA and byteball already have huge requirements for full nodes. People there complain it takes days for them to sync. And it's just the beginning.
So that's why I'm asking. A system that plans to be widely used as everyday currency must overcome these.