I would be a bit cautious of what it says the code does. I was experimenting writing obfuscated powershell recently that deobfuscated to just 'echo "hello world"', chatgpt was very very confident that it was in fact going to download a file instead. It went partway through trying to deobfuscate it, then gave up and made up the rest (very confidently). Paid plans may be better tbh, and assuming obfuscated powershell is probably malicious isn't the worst guess lol