That doesn't excuse false advertising. If a company wants to offer "enough foo for 99.9% of customers", they can say that. If a company offers unlimited foo, it ought to be able to provide unlimited foo (which it can't, of course, because it doesn't have unlimited money. Their problem.)

On a related note, I'd love to work for a company that offers unlimited vacation that's located in a country with decent protection against unfair dismissal. I wonder if I could get compensated for the (infinity-365) days of vacation a year I can't take?