How are wildfires propagating when hotspots are far apart from ech othr?

The wildfires seem to be miles away and isolated from each other, so how are they propagating?

Air-borne embers can travel tens of miles.

Birds can carry burning twigs (deliberately to spread fires to flush out prey).

Arsonists.

Lightning strikes.

Electrical problems: sparks, wires rubbing on trees, faulty wires, broken wires lying on the ground, etc.

Broken glass acting as magnifying glasses.

There are plenty of reasons for wide-spread outbreaks when conditions are 'just right' over extended areas for fires.