Too Long; Didn't Read
There is a simple legal rule: “everything that is not prohibited by law is Allowed”. While creating a DAO by itself is usually legal, but one would run into many troubles trying to engage into any meaningful economic activity with his DAO. Here are 3 options how to make a DAO legal: Directly register a DAO, create a legal entity and merge it with a DAO, make a DAO as a partnership. There are pros and cons for each approach. To determine the most suitable form one should talk with legal advisor.