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PDFs
(slrpnk.net)
A place to post ridiculous posts from linkedIn.com
(Full transparency.. a mod for this sub happens to work there.. but that doesn't influence his moderation or laughter at a lot of posts.)
It's not even that (and I think you mean are not).
It's because they are dealing with literally hundreds of resumes. They want to be lazy and just slap on their logo and be done.
PDFs just make this much harder than they want to put in.