Checked the reviews for this particular one, no one is mentioning fire. If you search for Apple charger caught fire you will find some, can happen to any electronic device.
I have three of them plugged in 24/7 for 3 years now and recommended them to others, all houses still standing. But you can also get the original 96 W charger from Apple, it's bigger so it can dissipate heat better than the smaller ones.
I would not trust reviews on any site that's incentivized to sell me something, but especially not Amazon which allows sellers to edit listings and put completely different products while keeping the reviews (not to mention inventory commingling so that even buying a legitimate product won't save you).