hello,
In dry regions, ants, termites, and dung beetles are great for shredding and aerating the soils,
Termites, are less useful in areas with higher amounts of water and on coasts,
the issue with termites, in some areas is eating wood of homes and of desired trees, such as fruit trees.
You can also find that ants have issues because they farm aphids, the aphids can eat away at your plants, and spread diseases.
when farmed it becomes harder to remove the aphids.
In regards, to utilising termites in huggel mounds this is not the best use of termites.
The best use of termites is as a soil digger, and nutrient hoarder.
In areas with high amounts of clay and seasonal rain, (wet dry seasons) a common method of utilising termites is to dig a hole organic mater and termites in the hole.
https://www.youtube.com/watch?v=mfblLpKKM1Q
What is better to do is to place porous sedimentary rocks along a line, and then build the hugel mounds, above the rocks, bigger to smaller with nitrogen and 6 inches of leaf litter and or grass clippings.
It is also wiser to put mushroom spores in the hugel than termites.