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Unless you unplug everything when not in use, you already have a dozen fire hazards at home. A PC that's powered off still delivers power to a bunch of components like the Intel ME, or nic for WOL; your TV, dish washer, washing machine, fridge, Alexa, smart hub, router, PlayStation 4 have some soc running 24/7. A pi is probably very safe, I've never heard of one going up in flames just like that. It's much more likely the USB charger it's running off will blow up of it's a cheap one from Walmart.

Also worth investing in a surge protector device if you're worried about your electronics getting fried due to electricity surges.

>Unless you unplug everything when not in use

I do

I thought the same as you for a long time and have a new fear for you:

You know that water pipes are in those walls too?

Hehe, you have so many things running 24/7 in your house already. Refrigerator, freezer, heating system, laptops in standby, printers in standby, routers in standby or active 24/7, HVAC systems etc.