DG is just coarse sand, mostly particles of granite. The pH varies with the material’s origin, but it has little effect on overall soil pH. Organic gardeners sometimes use it to enhance soil fertility. It is over rated as a material for pathways because when wet it turns into decomposed granite mud and tracks red everywhere. Also, it is an ideal medium for germinating weed seed, not preventing weeds. I hate the stuff. It is better than brick sand for leveling flagstone, though.