So as not to cause problems for themselves or others. Imagine you're a legal guy at bigcorp and you issue a DMCA because some clown uploaded [something shiny]

So as not to cause problems for themselves or others. Imagine you're a legal guy at bigcorp and you issue a DMCA because some clown uploaded [something shiny] to GitHub ... and then 10s or 100s of thousands of people got pissed off it was removed, and shown your phone number, email, etc. It's really a good policy for them to have - they don't need the fallout from people harassing some guy or some company, and the internet's always looking for an excuse to be outraged.