Just read this and found the NTSB report interesting.
Interesting facts, over the last 10 years, there has been 216,000 vehicle fires captured by NTSB. The fires break down as follows:
BEV - 25 EVs per 100,000 built caught fire
Hybrid - 3,474 Hybrids per 100,000 built caught fire
ICE - 48 ice per 100,000 built caught fire.
Added complexity is why the Hybrid is so much higher than ICE or BEV per NTSB.
UPDATE: Since this started with me randomly coming across the story at AutoInsuranceEZ, I took it for face value.
With the question below from @ccap41 started to search deeper and found this story from car and driver.
No, Millions of Cars Are Not Catching Fire Every Year
Seems NTSB nor NHTSA track auto fires, but the story says that quote "According to the National Fire Protection Association, which gets its info from the NFIRS, passenger cars averaged 117,400 fires annually between 2013 and 2017. And the Bureau of Transportation Statistics says that there were 261,037,752 registered vehicles in the US in 2018 (excluding semi-trucks, motorcycles, and buses). So, do a little division, carry the one . . . and that equals .04 percent of vehicles catching fire in a given year."
They have reached out to AutoInsuranceEZ but have not received any response back. As such, I have found many other stories that point to the NTSB that really end up quoting AutoInsuranceEZ. So it would seem we do not have any real detailed stats on this.
Sad as I would think there would be tracking, but due to what is stated above, it seems to be a very small amount and no clear picture of what powertrain is causing the biggest amount of fires.