LLMs now still generating content that contains misinformation, which will end up on the web, LLMs then can learn and propagate those misinformation in their future responses. That's one way this feedback loop can affect their output.
I'm sorry to hear about your layoff, but it's great that you're exploring AI. To improve your chances of getting a job as a PM or TPM in the field, consider networking, specializing in specific AI areas, building a project portfolio, continuously learning, and tailoring your resume to highlight your AI skills. Good luck!
Yes, it has happened before. In 2019, the SSL certificate for the Tor hidden service of the website The Pirate Bay was revoked by its CA. This was done after the website was found to be hosting illegal content.