They ignore robots.txt rules and seem to scrape as quickly and as broadly as possible. Unlike search engines, it doesn't matter to the LLM provider if the website is offline. Unlike search engines, they take steps to be anonymous and difficult to block, including using residential proxy services and other shared IP space.
I try and keep an open data repository online, but it was not designed for this. Cloudflare is hopefully a temporary fix while we redesign backend and frontend components.
The end result is going to be worse for users — slower querying, less flexibility as we primarily expose what we can precalculate, shifting CPU and bandwidth load to the user's device rather than our servers.
Luckily command+shift+t undoes.
What I do not appreciate as well is companies with larger money pool also resorting to and not caring for, for example Dell has the stupidest security check that has disappointed me (a human) enough times one time that I chose to buy a competitors product.
For example OpenStreetMap is using nowadays this or equivalents to prevent downtime and/or runaway costs.