Comment by andrewla

The Supreme Court has made only very narrow rulings around Bills of Attainder.

To me this bill seems problematic on that front in two directions. One is that it explicitly names a target of the ban. Secondly, it grants the president power to arbitrarily name more. Similar to how a King can declare certain Subjects be Attainded on His Whim.

But the petitioners (TikTok) did not raise this issue so the court did not have to decide on it. Instead they focused on the first amendment issue, which seems like a loser -- there is no speech present on TikTok that the law bans; any content on TikTok can be posted to red-blooded American apps like shorts or reels so the speech itself is not affected.