This does seem to be an industry standard practice when it comes to employment contracts. However, you are well within your rights to scrub this out before you

This does seem to be an industry standard practice when it comes to employment contracts. However, you are well within your rights to scrub this out before you commit to signing the contract. I've scrubbed this clause out of every contract. My intellectual thoughts that are outside and unrelated to this project are mine and mine alone. No employer in my mind has the right to that.