Best heat source for fondue? Will an induction cooktop work?
In my experience, the lowest setting of my induction cooker - 120 watts - is too high and results in scorched chocolate and will also burn dairy products like a cheese sauce. I wouldn't use it for a fondue - I would use a candle.

It's possible this restaurant had specialty induction cookers that could reach lower temperatures. My single-burner el cheapo induction cooker is standard off-the-shelf.

Edited to add:

I use my induction cooker, never my gas stove, for deep frying. With my induction cooker (which goes up to 2000 watts), 600 watts is the perfect setting for deep frying and no fiddling is required - it always works perfectly. So for hot oil fondues, where you're essentially deep frying meat, I absolutely would use an induction cooker. It would be my cooking tool of choice.