They do, and its a pittance.

Where are you getting this information? Are you a YT creator?

No, just public sources and seeing others review their income. Which part? YouTube shares details in [0] for how Premium earnings works, I believe the current split is 55% to creators. This is like Spotify where your payment is proportional to your eligible watch time over all watch time from all premium-eligible videos across all premium accounts. YT Premium Lite was announced here [1].

[0] https://support.google.com/youtube/answer/6306276

[1] https://blog.youtube/news-and-events/introducing-premium-lit...