It's been demonstrated that as ChatGPT usage goes up, traffic to sites dependent on SEO search ranking has gone down, roughly proportionally, every month over the last ~18 months. ChatGPT is free and fast and requires no technical know-how. Installing an ad blocker requires knowing what one is, and the time and energy to install a browser plugin. Pretty much everyone I know thinks free online ChatGPT type products is an absolute existential thread to Google's ad dominance. Even mediocre LLMs provide a vastly better experience than ad choked pages linking to ad choked SEO optimized websites serving (largely) google's own ads.