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production EV's have BMS's from the factories, in fact they have a well thought out and tested and integrated charger/bms/controller and they know the battery and motor parameters ahead of time. Some even use the large induction of the motor and the inverter circuit as a basis for a high power onboard charger (if it is plugged in, you aren't driving it).
But the DIY market either has really expensive and somewhat flexible (and more complicated) BMS systems or kinda cheezy ones, plus the wide variety of controllers and chargers (from manufacturers with no real agreed upon bms interface standards) that may or may not interface with those BMS (or any bms), so it isn't a huge market but has a number of players, including a lot of diy'ers who make bms's for fun.
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