Since one usually uses the top of portable DW as
Counter space a butcher block top is lost upon me. Besides have given up on wood cutting boards and such years ago for the ones that can be put into DW for cleaning and sanitizing purposes. No I tell a lie, still have a wood cutting board stashed somewhere but is only used for bread and cheese. Meats, poultry, and even veggies are a stranger to it.
What one does have on top of the portable DW is a huge (and heavy) marble slab got on the cheap. It is kept covered and used when baking for making crusts and such.