[gav]

There's a risk for wooden ones that are glued, specifically bamboo, or finished with something toxic. You should probably stick to ones made from a single piece of hardwood and are unfinished.

There's also a risk that any cracks will fill with bacteria.

[6510]

I think you've unknowingly debunked non-stick layers.

Should make it from RVS.

[ansonhoyt]

The latest issue of Fine Woodworking agrees and explains why this is true:

* "The Best Food-Safe Finish May Be None at All", https://www.finewoodworking.com/2024/10/10/the-best-food-saf...

TLDR; unfinished wood that is rinsed and dried on all sides will naturally trap and kill bacteria as it dries. Any finish interferes with this process.