Nope, just not able to login and use the marv account.
From the FAQ "On December 22, 2026, Arc for macOS and Windows will stop working, and you will no longer be able to sign in to your Arc account"
alt Hacker News
From the FAQ "On December 22, 2026, Arc for macOS and Windows will stop working, and you will no longer be able to sign in to your Arc account"