This is, of course, a total lie, since rice also always seems to come in the kind of plastic that does not rip or tear - it shreds. You try to open the top, but instead rips appear everywhere in the top two inches, and suddenly you're standing in a growing circle of grains, like a surprised bride. Trying to pour anything out of this jagged oriface is, naturally, doomed to failure.
Against this, the sticky label is pointless.
Why do they do this?
Because they're bastards, that's why.