Sounds like Amazon lost a lawsuit.
Or someone challenged them in court over being able to limit legal options in ToS to just arbitration.
And they lost.
Not sure you call that a lawsuit.
But they obviously lost something.
Nope. They didn't lose anything.
They had 75,000 arbitration cases filed against them. It's a strategy that has been effective in getting companies in front of judges (and in some cases juries). In this case, the 75,000 arbitration filings meant Amazon got a bill for over $10 million, since by their own TOS, they pay the filing fees.
While dropping arbitration completely is an unusual response, I can see Amazon wanting this to go to court. It's Alexa users suing for Alexa recording them. Obviously Amazon thinks they have a decent enough case to be willing to take on these 75,000 plaintiffs in a class-action suit. (Door Dash, Lyft, and Uber all still use arbitration despite getting bombed with cases too, though not 75,000, I think Door Dash had like 5000 cases filed.)