I agree with this, but prisons have no obligation to let prisoners do everything that's legal. That's kinda the point of prison. If SBF has some important information to share about what it's like on the inside or why he should get a pardon, he can forward it through his lawyer.

> Legally, seeking a pardon is no different than filing an appeal.

I don't agree with this. There's all kinds of ways in which formal legal processes are different than general speech, and this is one of them. Prisoners get to talk to their lawyer and file legal documents because these are critically important rights, which can't be suspended even for a good reason.