It's the first time I've seen actual stats mentioned (second paragraph). Of course the numbers are growing as is the use of ebikes and the fact there is some really crappy cells out there. NYC may ban them from public housing.
https://arstechnica.com/tech-policy/2022/09/e-bike-battery-fires-pushing-nyc-toward-a-ban-in-public-housing/
https://arstechnica.com/tech-policy/2022/09/e-bike-battery-fires-pushing-nyc-toward-a-ban-in-public-housing/