When a site blocks embedding, the browse page shows a card with a link instead of the page itself. The rotation used to put all of those card sites in one block at the end of the lap, so if you browsed far enough you hit around 20 cards in a row. I hit that streak myself today and it was a bad experience.
Now the card sites are spread evenly through the lap, about one card after every three or four embedded pages, and never two in a row. You still see every site exactly once per lap. Right now 82 of the 105 sites in the rotation embed, and 23 show cards.