I personally think it could be a great alternative to cars and bikes for those who need to take a whole family somewhere or a decent amount of stuff.
Only modifications I would make would be ride-by-wire and an extra set of pedals (so you can have two people pedalling without the annoyance of normal tandem bikes having to pedal at the same rate), and a more powerful motor (only 250W is legal in France, where this was designed, whereas 500W is legal here in Canada)
It looks flimsy as fuck I would not want to drive one of these plus considering they’ve got only four seats no protection from the outdoors and from crashes and no where to store any items there isn’t much in the way of practicality as well something like this would probably fail in an instant