They wouldn't, well there's Etag and alike but it still a round trip on level 7 to the origin. However the pattern generally is to say when the content is good to in the Response headers, and cache on that duration, for an example a bitcoin pricing aggregator might say good for 60 seconds (with disclaimers on page that this isn't market data), whilst My Little Town news might say that an article is good for an hour (to allow Updates) and the homepage is good for 5 minutes to allow breaking news article to not appear too far behind.

The big question here is this a verified-bot on the Cloudflare WAF? Didn't Google get into trouble for using their search engine user agent and IPs to feed Gemini in Europe?