Earlier quoted context omitted.
The latter is clever but unlikely to do any harm. These companies spend a fortune on pre-training efforts and doubtlessly have filters to remove garbage text. There are enough SEO spam pages that just list nonsense words that they would have to.
It will do harm to their own site considering it's now un-indexable on platforms used by hundreds of millions and growing. Anyone using this is just guaranteeing that their content will be lost to history at worst, or just inaccessible to most search engines/users at best. Congrats on beating the robots, now every time someone searches for your site they will be taken straight to competitors.
There are non-LLM forms of distribution, including traditional web search and human word of mouth. For some niche websites, a reduction in LLM-search users could be considered a positive community filter. If LLM scraper bots agree to follow longstanding robots.txt protocols, they can join the community of civilized internet participants.