Can definitely relate to the GitHub example. I sucked it up and went through the application, assuming that if I was putting this much effort into an application then I'd at least get some feedback. Got a short blanket email saying they'd gone with someone else and no feedback as to why.

I don't mind being rejected at all, but it's clear they have absolutely no concept of how much time it takes applicants to submit. The thought of ever going through that again means I'm unlikely to ever re-submit in the future.