Dont think you're immune the Cambridge Anylitica/Facebook debacle here on Steemit. This could become a watershed moment regarding your Internet data usage. It's not just about advertising but might seem so, especially with Google, Facebook and now Twitter Advertising bans
From Steemit Privacy Policy, section 14...
We will not share, sell, or give away any of our users’ personal information to third parties, unless one of the following circumstances applies:
Except as it relates to advertisers and our ad partners, we may share information with vendors, consultants, and other service providers who need access to such information to carry out work for us;
If you participate in contests, sweepstakes, promotions, special offers, or other events or activities in connection with our Services, we may share information with entities that partner with us to provide these offerings;