It is what is produced as a result of the content platform provider's efforts.
People who create content and then upload or share it on many platforms, grant the platform provider (and often their parent company and/or subsidiaries) an unequivocal license to use that content as they see fit. Zoom back pedalled on this, but they were amending their privacy statements in order to use calls for AI training. It is an example of how some platforms go beyond harvesting data (for instance, including all your contacts and even your call logs, from your phone when you run an app on a smart phone) and selling it to data brokers. There are some organisations actually looking to model and using AI, even replicate, human behaviour. This is the ultimate end goal for some tech giants and more nefarious organisations. I don't think we are too far away from seeing, to some degree, the demise of content creators.
There's already evidence out in the ether, showing how data has been harvested and processed in order to generate and effectively target messaging in political campaigns. This enables political parties or groups with deep enough pockets to get their desired result at the polls.
At an individual level, there are concerns and possible harms that arise out of mass data collection. At a societal level, it can mean the death* of true democracy.
*should such a thing have ever existed.