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Never give sensitive data like card numbers, passwords, or ID documents to AI systems accessible online, especially if you don't know who's running the service. A lot of free chatbots use what you write to train their models, so your information ends up in their databases. Even when they say they delete data, it's not guaranteed - it all depends on their privacy policy and how they actually apply it.
The risk varies quite a bit depending on what you use. If you're talking to an AI in an official app from a trustworthy company that's protected by login, it's much safer. But with random tools on the internet, the security gap is huge. The basic rule goes: don't trust an AI with anything you wouldn't want to see published tomorrow. If you really have to share something, anonymize it as much as possible - change names, specific dates, recognizable details.
The other thing to keep in mind is that even "secure" AIs could get compromised or hacked, like any online service. No system is immune. So being careful never hurts: use trustworthy AIs, read what they say about privacy, and especially don't share anything that could actually hurt you if it ended up in the wrong hands.
The most important thing is to understand where your data ends up: if you use a free service without reading the privacy policy, often your input gets used to train the model or sold to third parties. Even if you don't give sensitive information like credit card numbers, everything you write can be stored and reused. If you want to use AI safely, choose platforms that offer private modes (like ChatGPT Plus with "Code Interpreter" disabled, or self-hosted services), or use local versions that run on your PC without sending anything anywhere.
A risk that many underestimate is that even "harmless" data builds a profile of you over time. If you give chatbots information about your work, family, habits, preferences, a single company could assemble a pretty accurate picture of your life. It's not just about card numbers: it's the collection of small things that becomes worrying. Before using any system, actually read what data they keep and for how long, whether they share it with other services, and if you can request its deletion.
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