Comment by NewsaHackO

You are missing his point. He is not saying that the Caesar cipher is unbreakable by LLMs. These web scrapers are gathering a very large amount of data to train new LLMs. It is not feasible to use hundreds of thousands (millions?) of dollars to run petabytes of random, raw data into a frontier LLM model before using the data, just to catch one person possibly using a cipher to obfuscate their data. That is the value proposition: make your data slightly harder to scrape so that web scrapers for LLM training would rather let your data be unusable than make an investment to attempt to extract it.