they have the parental thing thought out. will have to see.
unless you are a parent, if not you probably won't care.
to me it all sound like people jus wanna save money by sharing games around. Nintendo (and most publishers) does't like that.
in fact 1 copy of the game can be shared with fellow Switch owners during local coop.
Oh ya there's the child account thing. If the kids have they own accounts that are officially set up under a parent's account, I guess no issue, the kids should be able to play digital game the parent bought, using the kids' own accounts. That's a guess only, it's the logical thing to do. But the parental thing (including limiting the number of hours the kids can play) could also be unrelated. Parental control is set such that a kid, using his own account, will not be able to play an M rated game, for example, not necessarily indicating sharing of games within the family is allowed.
The bigger question is sharing among adult accounts (no parent-child relationship) on the same Switch. These could be accounts owned by the same person, but he has 1 account in each region, a very common scenario I would think. Or imagine if a child account can play digital games owned by a parent, but when he turns 18 and the parent upgrades the kid's account to adult account (assuming there is such upgrade function), the kid loses access to the parent's games. Doesn't make sense. So there should be sharing allowed among adult accounts (guess only). Well, will know soon.
btw, I don't believe they have not decided yet about sharing on separate switch consoles. Surely nintendo had to tell the other publishers about it already.