Most are scams hosting malware, adware, or keyloggers. The few “working” keys are often stolen — and using them is software piracy.
No. The free version never expires. You only lose access to premium features like VST plugins and unlimited tracks. free mixpad registration code
If you need help choosing a free or affordable audio multitrack tool, let me know your operating system and main use case (podcasting, music demo, voiceover, etc.), and I can give specific recommendations. Most are scams hosting malware, adware, or keyloggers