"Vegetarians are deficient in Zinc because the diet is high... in copper. Which is why Zinc is low in the first place."

No, it is because the vegetarian diet has very little zinc in it.

"The only way to get a copper free multi (that I know of) is online."

One doesn't ned to take a multi though, they can take separate supllements, or take a multivitamin that has no minerals at all. There are several multi vitamins only products available.
500 mcg of copper isn't much of an added burden even if someone does have excess copper, but for someone who is very copper deficient the 500 mcg might make a big difference. That is why for example each 8 ounces of milk is fortified with 400 IU of vitamin D.


"And as a precautionary measure, I take a kelp supplement."

Beware of kelp. Some of it contaminated with arsenic and mercury. Buy only a reliable brand that is well tested, and even then be cautious and don't overdo it. I prefer to take my iodine as potassium iodide tablets.