Curate, connect, and discover
No, ao3 doesn't need a second kudos button or a kudos button each chapter, because you know what you can do each chapter? Comment. It needs your words, your comments, there is a comment draught, kudos is lovely, but it is a ping in a lonely chamber, a lecture hall where you can tell students are listening but no one ever raises their hands to speak or engage with the professor, if you love it so much you want to give a second kudos, you love it enough to type even just a couple words into the comment box, "love this," "neat fic!" It's just a couple more clicks!