the bitcons that are mixed with joinmarket are collaborative transactions, there is no hot wallet, you always keep possession of your bitcoins just like whirpool or wasabi, only joinmarket is decentralized, there is no central entity behind it, it can't be shut down.
Discussion
But is a market made of makers and takers right? In order to be a maker i would imagine you need to deposit your liquidity somewhere? Or am i wrong?
As a maker you only allow your bitcoins to participate in collaborative transactions, but these bitcoins never leave your private keys, joinmarket is a non-custodial coinjoin system.
The fact that you participate in a collaborative transaction does not mean that you have to give up custody of your funds.
If at any time the coinjoin is interrupted you get all your funds back.