Conversation Focus amplifies the voice of whoever you are talking to. Meta capped it at three hours a month on glasses people had already bought, and going past that meant a $20-a-month Meta One Premium plan which itself stopped at 15 hours. Engadget has the numbers.
Meta paused the tests after the reaction. Spokesperson Tyler Yee told The Verge, "we heard the feedback so we're pausing its subscription tests for now." 9to5Mac's Ben Lovejoy described it as a paywall applied to hardware people already owned, and Gizmodo notes more paywalls are still planned. This is a retreat from one cap and not from the idea.