This piece explains it quite well
I disagree. I think it's poorly written and badly researched. For one, it calls Google a "dying business", which is
absurd [statista.com].
The author's experience with AdSense seems to be limited to a failed YouTube channel. The supporting evidence for her conclusion that "the algorithm is no longer profitable for creators" comes from a YouTube search for "I'm leaving YouTube". For good measure, she throws in banner blindness -- a term coined in 1998, for Pete's sake. "My boss no longer makes good money with Google Adsense," so it must be in decline. I could go on.
It goes without saying that the continued arrival of self-contained platforms like Facebook, Instagram and TikTok, as well as other revenue models such as Patreon, has an effect on Google's ad market, limiting its growth. Content creators and advertisers simply have more choice, which is great. Still, while some types of content or ads will be better suited for TikTok or Patreon, others will fare better on YouTube. And I don't think it's true that "content creators and users now prefer subscription-based payments". Some creators can do well with subscriptions, but I think the vast majority of content is still consumed "passively", supported by advertising. Users who have paid subscriptions to some creators still consume lots of ad-supported content by other creators that they won't want paid subscriptions to. So it's absurd to conclude that "content creators should change their money strategy."
One problem for content creators, especially those starting out now, is that the competition is so enormous. You have to be lucky, very talented and/or original to stand out among the millions of other creators and go beyond "paying for Spotify with Google AdSense", and that goes for all platforms, not just YouTube. The author didn't make it, but shouldn't feel too bad about that; millions of others have tried and failed. But if it wasn't viable for some, you wouldn't be seeing all this new content.
I have websites with content types that don't really lend themselves well to other platforms, and they're thriving with AdSense. I don't know if they'll continue to thrive for another decade -- things can change quickly online -- but for now that's enough evidence for me to conclude AdSense is far from dying.