Ad tech is annoying at worst, it doesn't take literally your job and most of job market with it. Without any seemingly easy way to move to fields which are booming so overall it would stay the same.
I hate ads with passion for past 20 years and (very) actively avoid them at all costs, but I'd take those over what world llms seem to be bringing in soon.
Consider LLMs as the recent iteration to monetize free content, like ads do too, and you are not far from seeing the approaching AI-first enshittoscene. No matter the smart engineers altruistic goals, ROI has to be met.