This is absurd. The charity can immediately sell the stock if it wants to. There are large tax advantages to the donor for donating highly appreciate shares of stock (see https://www.google.com/search?q=donating+highly+appreciated+... ).

If someone were planning on giving to charity anyway, it would be crazy to pay the taxes on the appreciated shares and give what is left over after taxes to the charity, when you could instead just give the shares (the charity would still get the full value even if the shares were immediately sold, because most charities are tax exempt).