The legal standard is, roughly, if the contract is "unconscionable".

The courts have repeatedly ruled that most arbitration agreements are enforcable.

The FTC has previously attempted rule making to invalidate predispute arbitration agreements, but a trump era Congress "disapproved" the rule. The solution at this point requires an act of Congress.

https://arbitrationinformation.org/docs/problems/ is my website where I try and summarise everything I know along with sources.