Thanks for posting that. It could impact something I’m working on. Do you have any idea how many requests it takes to trigger the limit?
Looking at the YouTube API docs, it seems that they allow up to 10k GET requests per 24 hours, but this is for requests made with an API key: YouTube Data API Overview | Google for Developers. It’s not clear to me how rate limits for unauthenticated API requests to pull in the video preview images are rate limited.
I don’t think there is a rate limit applied to videos being played via an iframe, but it would be good to confirm that: YouTube Player API Reference for iframe Embeds | YouTube IFrame Player API | Google for Developers.