Devs are not doing anything actively to fight money laundering (ML), but they are also actively not doing something to make ML easier.

Let me explain.

If they wanted, they could have implemented Monero or Mimblewimble-level tools to hide our transactions. But they didn't, because (i) that's hard to change Bitcoin and (ii) it would be a losing battle. The government agencies are very happy with the way things are now, with the proper tools, they are very much able to track illicit transactions. They count on the fact that at some point, someone will fuck up and reveal their identity. Look at all the stolen Bitcoin that got recovered over the years. However, if Bitcoin were to become more private, these agencies would have much more incentive to go after Bitcoin. They don't, so as not to push Bitcoin to become private. It's a nice equilibrium we got there.

Crime happens mostly on Monero now, not on Bitcoin.

Monero and Bitcoin Lite (which implemented Mimblewimble) got banned on several exchanges. Bitcoin didn't, because it is rather a gift than a threat in fighting crime.

H/T for this theory to Antonopoulos, from a talk he gave a few years back in Seoul