Dropbox's ToS is one-sided because what Dropbox did was carve out the ways it would want to go to court and eliminate the ways most consumers would ever take it to court. Most consumers are not suing Dropbox over IP.
For another example of companies carving out justice for themselves, check out Wells Fargo. They say they will not initiate arbitration for debt collect (translation: they still have their right to take you to court if you owe them money) but if you want to hold them accountable for fraud and negligence, you are going to forced arbitration. https://www.wellsfargo.com/downloads/pdf/credit_cards/agreem...
One last thing on Dropbox's opt-out, why should you have to opt back into your constitutional rights?
It says in the exceptions to arbitration that Dropbox still retains the right to take consumers to court for intellectual property infringement, but if Dropbox has a massive data breach and every private file you have shared becomes public, you're on your own facing Dropbox in forced arbitration.
For another example of companies carving out justice for themselves, check out Wells Fargo. They say they will not initiate arbitration for debt collect (translation: they still have their right to take you to court if you owe them money) but if you want to hold them accountable for fraud and negligence, you are going to forced arbitration. https://www.wellsfargo.com/downloads/pdf/credit_cards/agreem...
One last thing on Dropbox's opt-out, why should you have to opt back into your constitutional rights?