Chrome seems to have made one change recently -- maybe related to this? -- that made it so YouTube videos embedded in other sites no longer have you logged into YouTube.

This means that if you have YouTube Premium, where you pay $10/mo so you don't have to see ads on YouTube videos, you still see them when the video is on someone else's site. Oddly, it still works as it used to in Brave.

Since this is sort of cross domain cookie related (YouTube uses an iFrame typically when embedded, whether embedded by pasting html or by using the JavaScript API), does anyone know why this happens? If you ask YouTube Premium support, their canned answer is "we don't guarantee no ads except on the YouTube site." But they can't explain why it works with no ads in non-Chrome Browsers.