Although I've taken a quick look, this doesn't seem to be discussed, and I think it should.

It looks like Binance has decided to consolidate their wallets/transactions last night. It's something they do now and then, but the current timing could not be worse.
And from CZ I do expect to be a deliberate move (usually in his favor, not ours), but I don't understand the reasons. Spamming mempool now means more panic to the average Joe in these days he's overly panicked. Does he want to make people change their minds about withdrawing from exchanges? Or does he try to cover some exchanges that can now claim withdrawing issues? I don't know.