Too many users abused unlimited Dropbox plans, so they’re getting limits::Some people have taken “as much space as you need” too literally.
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For your last sentence, Dropbox can’t tell whether those are legitimate backups that the DMCA gives you the right to, or rips from a piracy site. Uploading data that’s all 1’s is just dumb and is designed to “test” the server, in the same way a teenager might test their stepdad.