If I owned a boat no one with a battery would be allowed onboard without one of those bags. 33 people, all with cellphones and cameras...hindsight is always 20-20 and we don’t really know if this was the cause, but now we know it could be the cause.
I started using hobby-grade LIPOs back around 2000 or so. None of these battery packs had the protection circuit. This technology was so new that none of us knew the dangers of unbalanced packs.
Many people lost their homes, garages and cars when they put their LIPOs onto charge, then walked away, went out to dinner, etc.
After seeing results of these fires (lithium smoke is also caustic in addition to being toxic) it became standard practice to either set a watch on the batteries while charging, or charge them outdoors in a safe area, or use a charger bag.
I used to charge my LIPOs in my fireplace. First, I could watch the batteries charge while watching TV. Second and third, the fireplace is designed to contain extreme heat and vent toxic smoke and fumes safely out of the house.
Most people today don't give battery charging a second thought, nor do they understand the dangers of packs without the protection circuit. (cheap chicom knock-offs)
I'm sure that many commercial operators will now insist on everyone using bags or that charging will be done out on deck.