This sure sounds like something that can be completely solved by getting a new account. But then there's this hilarious excuse for insisting that the problem remain:
Although users can "abandon the accounts and start again with new Apple IDs," the report notes that doing so means losing all purchased apps, along with potentially years' worth of photos and videos.
If there's any risk of losing photos and videos, then they should already be working on fixing their backup system immediately, before something bad happens. This isn't so much a problem as a wake up call that they haven't yet done one of the most basic first-things in using computers: get data backups going.
Loss of access to an external data storage account is just one of the risks they aren't protecting themselves against, with regard to that data. (And geez, since they're already cloud-storage enthusiasts, what was their plan for what they were going to do if they ever found a better cloud provider?)
As for proprietary apps: same problem, they already faced the risk even without this parental splitup. Either stop doing that, or accept that you occasionally have to repurchase your proprietary software. Given how much crap is monthly subscriptions now, I suspect there's very little loss here anyway, since having to continuously repay is already the status quo for an increasing number of .. [sighing and trying to remember to be nice] .. inexperienced computer users.
But if it's not (yay! it shouldn't be), then either suck it up that you have to re-do a "one-time" purchase, or [gasp] contact the manufacturer of that software and tell them the problem.
Oh, it's some company who is unresponsive or says "fuck you, pay me?" Well, then you're the one who decided to do business with an unresponsive company. You were already fucked and just hadn't run into the already-looming disaster anyway. Glad you're learning about how stupid that was while you're a teenager instead of later, when the stakes are going to be even higher.
All objections to "get a new account" are bullshit. And worse, they just point out problems that these people can/get-to/should face now, before anything bad happens.