This is something I've never seen before.
To frontrun an exploit in the mempool a generalized frontrunner copied the exploiter's 4 (!) previous transactions stretching 50 blocks (!) into the past.
That copied the exploiter's contract and setup for the exploit.
Interestingly this actually looks like a generalized frontrunner did it. 0x15d8 deployed a very similar contract and did the same setup, but once he submitted the work() transaction to the mempool, 0x67a copied the entire setup and did it all in block 16384470, one block before