The article made it click for me why they seem to care so much about you damaging your electronics lost in the seats. Is there something about air travel that makes these batteries go or is it just a relatively uncommon thing that creates a common problem given the number of flights?
You're in an enclosed tube with lots of people, so fire is a lot worse. Most lithium ion battery fires in cabins are from loose vape batteries, probably shorting on keys or change. Some are from crushing pouch cells in tablets or phones, sometimes by seats. Besides that, there isn't anything about planes that is causing these fires.
Cheap chargers also likely contribute. There's limits to how much charger misbehavior even the best batteries can tolerate and some of the charger bricks sold on Amazon, in gas stations, etc are horrifyingly bad.