Let's say it is biased, does it make it any less true these people used shell companies to obfuscate their holdings? Or, are you saying this behavior is okay and in which case it would not matter?
If you look more carefully it does list some less known Americans.
If the leaked documents implicate important US figures, but the reporting of the leaks do not mention them, then the public will interpret that as "see, US figures are not engaging in this activity!".
In other words, the reporting of this leak can be used to shame / reputation smack anyone who is on the current Western
hit list while masking that behavior for anyone that the Western media outlets want to protect.
Yes, that's one take. Another take is exposing some is better than exposing none.
This is like saying, hey the news mainly shows when white cops beat up on black suspects, but it doesn't much show when white cops beat up on white suspects, (or any other combination) so they should not show any.
If you look more carefully it does list some less known Americans.