Putting all the electronics right over the hot oven was apparently a tricky problem. Induction cooktops with no oven have been available and inexpensive for a while - this is probably part of why induction is more popular in Europe, where ranges are less common.
The induction range is coming down in price quickly now, so it may be they’ve made some progress on this issue. Just two years ago the cheapest was $4k.
(Range = cooktop and oven in one freestanding unit)
Here in Europe 4 burner induction cooktops start at around €350.
https://www.mediamarkt.de/de/product/bosch-pie631fb1e-kochfe...
There again 95% of new houses here have induction, so the price difference you are seeing is probably because market demand is that much lower in the US.
Out of curiosity I checked the two home improvement stores where I live, and the cheapest ones were $1,500+. An old fashioned smooth top electric range/oven starts around $700.