They've been doing it for years. These AI answers at the top are just their latest addition (as said, probably to try and keep up with what's going on).
https://searchengineland.com/how-google-uses-artificial-intelligence-in-google-search-379746
@Alice @Tritz @Utah44 I"m not quite there with totally tuning out Google's page-top overviews, so they're a bit annoying depending on which device I'm on.
To the other point about "this is how Google search works"—yes, I've watched it degrade over the past several years. (I keep using it so I can see what my undergrads see when they won't use the library databases they paid for.)
@harmonygritz I'd say because they are aware of the potential of the rising competition. Shouting "keep using google, we also have an AI to answer questions".
...
(Why do you think they added shorts to youtube?)
And just to be clear about it. I was talking about google search in general, not these more recently added AI answers.