I would seriously question the competence of Nintendo developers if their system cannot survive an unexpected shutdown. Computers losing power unexpectedly has been a possibility for server and desktop computers since those form factors were first created.
Sure, maybe some clever code cowboy decided that since the system will always have a battery, their OS can be optimized around never losing power. That reasoning should have been rejected, with prejudice, in a code review. Batteries fail and the older they are, the less charge they hold. Even if the battery is still good, the connection between it and the rest of the device can wear out or come loose.
From what I have seen, there was nothing yet about Rozier betting on games either directly or via a proxy. Just that there was an unusual number of betting on the under and Terry leaving the game early. The NBA investigated the issue and cleared him, so I wonder if it was someone other than him that caused the unusual betting pattern. For example, people on the team knew that he was hurting but wanted to see if he could play through it.