There's an interesting preliminary question involving whether this can be brought as a class action. People applying for DAS had to agree to what's called a naked class action waiver; they had to agree not to proceed by way of a collective action without an accompanying requirement that the parties arbitrate instead of going to court.
Besides calling the naked class action waiver unenforceable, coercive and deceptive, the plaintiffs are alleging that it violates California's version of the ADA by creating a discriminatory barrier to those trying to assert their right to disability accommodations.
The reason this is interesting is because Disney recently backed off of a ridiculous claim that a plaintiff injured on its property had agreed to mandatory arbitration by signing up for Disney+. But the type of class action waiver signed here has been upheld and there is no question the plaintiffs knew what they were agreeing to because it wasn't three steps away in a subscription to a completely different service.