To be honest, I wonder why IPS did not leave marketplace as platform for sellers and instead closure could introduce e.g. monthly, constant payments, then instead taking money directly, could allow seller to define the target payment method.
I use my Commerce this way, so when buyer comes to purchase something he sees who he buys from (exact details) and this way I am responsible for nothing, except colleting money for using the platform.
My only guess is that IPS wanted to get a rid of all custom apps/plugins before IPSv5