Free version of softwares are the dangerous zone for the computers

Hey never install any free version of softwares unless your familiar about the company that has made that software your downloading. Because free versions can surely have a part of some stupid programs to harm your computer. Why do the companies wants to give a software for free just think ?....for atrracting you by the software design and feautures, by installing the software you just sometime crash of your system files and spend money for the service. Nobody in this world gives something for nothing. They give something to take something.