system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is dryer lint so flammable?

What it says on the ~~tin~~ title.   
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Per rule 7, performed a search and found a 4 month old post with two replies and no real good answers, and a few comments in related threads about lint that touched on the suspect but didn’t really answer it.
gpt
Things ignite easier if there is maximum surface area between the air and flammable material.

It's the same reason why grain silos filled with grain dust can spontaneously combust if they get hot enough.

Lint is made up of lots of tiny fine particles stuck together.

So there is a LOT of surface area between air (oxygen) and the combustible material, lint.

Conversely, it's hard to ignite a large log from just a match, because there is not enough relative surface area between the wood and the air to sustain the combustion.