Why would GMs bother making vend bots? It's illegal by RMS standards (even if not "charged" to be delisted, it's still a giant reputation damage) to use such methods to boost population, and if we only want to make convenience stores, we would've done that by moving NPC shops around.
As for how they transfer, they transferred like anyone else who has merchants on a separate account. Nothing too special about it. Especially since they are just convenience store, you can now even use the heRO BBS to transfer.