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I guess I shouldn't make that much of a distinction; if you UToY or VToY a rainbowed'd clip it would look just like dot crawl. The main difference is that you can use much harsher blurring to make it look good than for dot crawl, since a little chroma bleed is more tolerable than edges disappearing.
The whole problem comes from luma and chroma being mixed together in composite video and then unmixed. Not only is the process lossy at certain high frequencies, there's an enormous amount of RF interference that tends to get picked up by the unshielded cables that act as an antenna; channel 3 or 4 is normally used, but usually someone is transmitting on them in the vicinity, making noise even worse.
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