when I upgraded from gas to induction, I was under the impression that all cookware sets that arent labelled as €˜induction-ready are naturally incompatible with induction cooktops. However, some stainless steel and cast iron pans turned out to be just fine for my induction cooktop that I found in this post - https://bestkitchenbuy.com/does-cast...ction-cooktop/
Its just that cast iron pans might scratch the smooth top if not used carefully. Further , there are clever ways like using converter disks to use completely non-induction cookware on induction cooktops.

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