Why do Rv sink covers say not to used with food

Wood would not contain lead.

I've got 2 of the white vinyl ones, they don't say anything about not using them for food, makes no sense to have a cutting board That's not to be used for food.

If it's a wooden cutting board, there's not much chance of the wood containing lead. I can't even think of any wood finish that might commonly contain lead besides lead paint, which (besides being obvious that there's paint) presumably wouldn't be legal to sell these days.

If the feet or other hardware is brass, the brass may contain a couple percent lead. So long as you don't cut tomatoes on the screws holding the feet on, you have nothing to worry about. The label is probably just legally required information, or lawyer suggested information, to prevent silly lawsuits...kind of like how four-fifths of everything causes cancer in California.

Maybe the label contains lead, and should be removed before using the cutting board?

This one says non-toxic and nothing about not for food.
Camco 43431

This one says about the same thing.

Bamboo sink cover

Where are you reading about not to use for food? Am I missing it?

its wood one was bamboo the other is oak

What is model of sink cover you were looking at?
Sink cover

Probably a CYA maneuver.

We always just bought the wooden ones from Camping World.