@neurovagrant "defi" is the third leg of the crypto money laundering machine though i think most people understand how that part works less well than how the mixers and bridges work for laundering. you definitely need to have a basic understanding of what "defi" is.
tl;dr it's just financial machinery governed by smart contracts. 99% of it consists of either lending operations (e.g. Sky/Oasis FKA MakerDAO) or automated market makers ("AMMs" - mostly #Uniswap, which is what i get into in the substack post i just linked in some detail).
the lending operations are the ones most often hit by exploits of bugs in their smart contract code. both are used to launder stolen money, albeit in different ways.