I wonder just like retailers are required to account for local sales taxes (I know it is not that clear cut), there should be some enforcement mechanism to settle disputes locally. Setup an agency which "legally" provides support for google, Amazon, and all those unreachable entities. Provides local jobs as well as quick grievance redressal. Maybe something like consumer protection agency but not federal, maybe at least one per county maybe more depending on the population.

Edit - I don't mind paying for the service. Maybe charge everyone $99 to file a case to avoid everyone piling on, but it helps resolve most egregious ones, and fee could be refunded at the agency's discretion.

I can't speak for how effective the process is, but this is the idea behind the EU/UK GPSR's Authorised Representative framework - though not exactly local (that would be excessive, since GPSR also applies to much smaller sellers too)

Some kind of court, for small claims?