@amicklei the problem will be poorly made cells. A normal cell made by a good brand will likely not be any issue for anyone unless it gets pierced.
But cells used in cheap items, such as random power banks from no-brand Chinese firms, that use badly made cells are a risk. It's why we keep seeing things like escooter fires, as the manufacturers of cheap ones use bad quality cells.
Honestly, we should be tightening up import controls on them as well.