When I read an article that DAG was created working differently from blockchain. Where blockchain requires approval from miners on every transaction, DAG manages to overcome this by getting rid of the block completely. In contrast, DAG transactions are linked to each other, which means one transaction confirms the next and soon.
Wow, your post encouraged me to do some research and I found out that IOTA is not the only cryptocurrency built not on the blockchain. DAG technology is potentially amazing, I am sure it is a viable alternative to blockchain, because of not being safe from quantum computer solving crypto puzzles and since the transactions are fast and cheap/free. My favorite one is still iota, though, because it doesn't only exploit the fancy tech, but also has very real use cases related to the Internet of things.