Don't sign the agreement if you don't like it.
Don't sign the agreement if you don't like it.
For example, a contract in which I forfeit my right to life or ownership of my own body would be considered invalid.
The same should be true of a contract in which I forfeit my right to sue. Half the point of the courts is to serve as a final arbiter when a contract is insufficient.
I'm not sure I see the relation to powers of attorney. Are you saying that granting PoA to another person is similar to granting enforcement rights to an arbitrator?
If mandatory binding arbitration included as part of your standard interaction with businesses is a net negative for 99% of people and a positive for business owners and large stock holders there is no particular reason why the 99% can't vote not to allow the owners to do that.