In Japan where there is a long history of using bamboo for various things from art to tools, including cooking items, there is no practice of using bamboo for a cutting board. In fact the same holds true for other Asian countries as well that have long histories of using bamboo. Bamboo is considered too hard as a material for use as a cutting board. Bamboo is not wood. It is an extremely hard grass. It does not grow solid like a tree, and in order to produce a "board" it must be put together with
addhesives. There is much debate regarding formaldehyde resin safety. But some of these adhesives can become even harder than the bamboo itself.
Additonally constructing from pieces can produe seams for bacterial growth. Another aspect is that while wood boards may crack over time, bamboo can splinter or get "fuzzy" (surface shredding of fiber). The only folks touting Bamboo Boards are their makers and sellers.