an American corporation does in fact have some recognized legal personhood, and so a 'bill of attainder' could technically be found to exist within a legislative act which violates the legal rights of one.
Nope. Operant part of an attainder is no due process. In one year’s time, DoC will have to prove ByteDance is in violation of this law in a court. Simply naming a person isn’t enough to make a law an attainder, not even closely.