Unlike eucalypts in Australia, in California and Hawai'i nothing eats them. Tasmanian bluegum is the most common eucalypt in that range [0]. Therefore a) they grow very rapidly, and b) are useless as structural or furniture woods. The Berkeley Hills "Tunnel" fire of 1991 [1] was driven in large measure by the presence of eucalypts. In much of northern California today, eucalypts are seen as large flammable weeds.

[0] https://www.fs.fed.us/database/feis/plants/tree/eucglo/all.h...

[1] https://www.caloes.ca.gov/FireRescueSite/Documents/CFIW-Oakl...