It's never a good idea to upload anything personal or confidential to cloud-based AIs, as many of them use your prompts for collecting or training purposes. If you want privacy, its best to run LLMs locally. If a site does not say that sign-up is required, then you can still use it without logging in, but you will have worse limits and fewer models.

Keep in mind many coding AIs run in root, so its best to avoid giving them full drive / root access to avoid any sort of issues or accidental deletions. Remember to backup code first before running the AI or prompts, as they can sometimes break things.

Bypassing chatbot safeguards (aka jailbreaking) is against the TOS of most AI, so use them at your own risk.