Because of how embedded mobile phones and cameras are into our lives now, the field for collection of personal data can give a company a huge database of information on anyone based on how they interact with their phones.
Even your phone and Alexa devices are literal microphones that can tap into your personal life at any given time. When this is combined with social media, email, photos and videos, and of course your browser history, anyone can be targeted at any time by these private companies for any reason.
Blackmail will be a likely result. Corporate espionage will also be a constant threat. The future is going to be wild, and we'll likely need to lock our phones up and have private conversations in rooms with no tech at all unless privacy invasion and surveillance is reigned in properly by Gov leadership around the world.
There is, in contrast, probably a fast growing pool of independent hackers and whistleblowers out there to counter these bad behaviors and practices by big corporate interests... The future is both interesting and scary citing all of this.