Why a relative replaced some perfectly good Michelin Tires?

Never really heard of such a thing, will scan the tire stewardsip board and see if there is mention of anything like that here in canada.
If the manufacturer is mandating
This policy, then perhaps they should start a program that recovers 10 year old barely worn tires,at least offers a rebate of sorts. If safety is job one,then it would be in their best interest to
Replace the tires at a reduced cost to the consumer.
My mom drives less than 300 miles per year, car is garaged when not in use. 3000 miles is like zero wear.