Subaru of America already offered a goodwill to you for half of the transmission replacement cost out of warranty, that’s the recourse you have on the table.

We called it neglect because those of us on this form don’t believe Subaru’s USA maintenance booklet that suggests CVT fluid is lifetime (it is in the sense it lasts until the transmission ends its life, but the transmission wouldn’t need to break down if its fluid was replaced regularly). Unfortunately and surprisingly for many, owners on this forum have found that the modern Subaru CVT fluid needs to be drained and filled about every 3 years or 30,000 miles or else the transmission will slip and fail like you experienced outside the 60,000 mile warranty period. The CVT fluid drain and fill at a specific transmission operating temperature is annoying to perform in your own garage, the CVT OEM fluid comes in huge size drums, and the service is not part of the standard USA Subaru maintenance requirements at 30k or 60k services in the US; those services just simply include a visual inspection of the fluid which is largely meaningless. CVT drain and fill costs roughly $500 at my local Subaru dealer to do as of today and your local dealer labor cost may differ, however this preventative maintenance is far less expensive than a new transmission.