So, what sparked the creation of Open Source?
With the introduction of proprietary or closed source, which follows the monetisation model of catering to the consumer’s request and preference for a given price, the software’s publisher retains the intellectual property rights (copyright of the source code) and poses major restrictions including the inability to allow modifications and redistribution of the software, unless an exchange of monetary was made.
In response, Richard Stallman said
My project is to make all softwares free.
Thereby, the introduction of Open Source software.