He does make an interesting point. Data is a trillion dollar industry - how do you think Google, Facebook etc make their money ? Advanced advertising is only possible if you have a lot of data about demographics, target audience etc and the advertising platforms for these types of companies are really really granular - all the way down to people's political alignments (think Trump 2016 and Cambridge Analytica). You had the NSA scandal a few years ago where they were just collecting data of flowing traffic and storing it in large data centres for "future use". The developments in AI, and machine learning/data science are opening up all sorts of possibilities in processing/visualising data in ways never fathomable only 5 years ago.Then you should always wear a hat made from cooking foil. What I wonder, use do you think they might make of that information?
This is in part why the EU introduced GDPR - can't have scandalous political footprints somewhere out there in a vault.