The fix for https://github.com/dutchcoders/transfer.sh/issues/215 led to @ being encoded as %40 in filenames in the URL returned, which is awkward when working with social media scrapes since ArchiveBot normalises it to @ again.

Keep the dirty URLs on Instagram because they're not that dirty and are linked from the profile pages. I usually throw it into ArchiveBot anyway such that it grabs the non-"taken-by" URLs as well.