"Some authoritarian governments could be interested to buy information about who I am."

Were they interested, they already have that information. Tron has no greater access to it than any other individual or entity, because the blockchain has been publicly available since it's inception. All that data has been publicly available about you since the moment you posted it, without restriction or reservation whatsoever.

Even if you seek to delete it, you cannot. Unless the consensus witnesses change the code, all that information is a permanent part of the Steem blockchain publicly available for audit to any and all parties that seek to do so, including authoritarian governments.

The difference between Steem blockchain and Fakebook or other centralized platforms, is that on Steem the information is also available to you, or any party or entity, while centralized platforms exclusively possess the ability to access that information, which they can then sell as only they can get it otherwise.