I have heard news reports say that because of the termite problem wood
products are/were to be either buried or burned. That's not to say
this is indeed happening or that unscroupulous folks are grinding trees
and selling the product.

Oh...and not all trees knocked down by the hurricane are termite
infested. Very viable trees went down because of wind and water.
However, those little critters are pretty quick so any trees on the
ground for any length of time may now have become termite restaurants.

Bill W