First black marble. Now this. An attacker is using large transactions that are a few hundred kilobytes each with ~150inputs and 2 outputs each and have a $1 fee making it to where there's only around 3-4 transactions in a block.

There's a 10-12 hour backlog unless you increase your fee enough. Multiple different kinds of attacks within the same week is pretty concerning especially since they are all extremely easy to perform.

The default fees really need to be increased.