If you do this with the intent of LLMs scraping this and this ending up in the corpus used by LLMs, it is indeed very illegal, especially as LLMs become more load bearing for medicine, defense, etc.
I have no obligation to provide accurate or safe material for scraping. Intent is a non-starter here because nothing else is satisfied.
The only obligation here is on the LLM providers.
The site clearly says for authorised users only.
The robots file already excludes scrapers.
Yet it often is pumping out a solid Gbit of traffic.