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The AI company Perplexity is complaining their bots can't bypass Cloudflare's firewall
(www.searchenginejournal.com)
This is a most excellent place for technology news and articles.
I think part of the issue is that it does act more like a search engine crawler than a traditional user. A lot of sites rely on real human traffic for revenue (serving ads, requests to sign up for Patreon, using affiliate links, etc) that gets bypassed by these bots. Hell in some cases the people running the sites are just looking for interaction. So while there is a spike in traffic, and potentially cost, the people running these sites aren't getting the benefit of that traffic.
Basically these have the same issues as the summaries that Google does in their search results but, potentially, have much larger impact on the host's bandwidth