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Because, when it is used in construction:

https://en.wikipedia.org/wiki/Grenfell_Tower_fire

Can I ask how you know these things? Materials science is pretty far outside my area of expertise but I'd love to get a basic understanding of it.

There are a bunch of standards for material fire classification, which may differ from country to country, but they're not really available to read online for free most of the time. You can do some googling around A1 fire classes, EI fire rating and so on.

A useful thing to know is that a house fire revolves around 800 degrees Celsius typically, so you should expect various materials that have a fire resistance rating to take more than that for a sustained period.

Wait, what happens to brick after 180 minutes at 1000 Celsius? I assumed they would either burn or not burn, melt or not melt.

It's just one standard, it doesn't mean anything happens to the brick, they probably just stopped testing at that point.