While LLMs have accelerated, it, it was already the case that silos were blocking non-Google and non-Bing results before LLMs. LLMs have only made existing problems of the web worse, but they were problems before LLMs too and banning LLMs won't fix the core issues of silos and misinformation.
The decentralized nature of the internet was amazing for businesses, and monopolization could ruin the space and slow innovation down significantly.