Youtube uses a hidden opt-out button in a full-screen premium upsell.

""Getting desperate now? This came up when I opened the @YouTube app. I don’t want premium. I don’t want a trial. I’ve said that at least a hundred times so far, now this without even a close button. Talk about @darkpatterns”

Disclaimer: examples in the Hall of Shame are generally drawn from public submissions and cited sources; they have not been independently verified and may contain inaccuracies. They are presented as illustrations of design patterns, not findings of fact, unlawful conduct, or intent.