I've heard rumors that people think it gets your application through the process faster, because the automatic scanners can't read the application, and it must be reviewed manually to be processed. It is absolutely true that the scanners can't read applications printed on blue paper, and, that it must be inputted manually. However, it will NOT decrease processing time, and can in fact delay it further, especially if the the printed copy isn't legible either. All mailed in applications mailed in are converted to digital. White paper with typed, black ink is best. Avoid blue ink for hand written applications for the same reasons.
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source https://www.reddit.com/r/immigration/comments/gtx3fs/please_dont_send_in_us_immigration_applications/