You make a good point. One reason Amazon can be so nonchalant about this data breach is that they are a near-monopoly. They are - essentially - the only game in town.
Not really. They are the most important player in town, but far from the only.
Much of the stuff sold through Amazon is also sold directly through the manufacturer’s own website.
It IS a lttle more work, but my wife and I are creating the habit of finding items on Amazon, and then looking for a direct maufacturer website, or, failing that, seeing if it’s available from Walmart or other merchant.
Amazon purchases aren’t eliminated, but are significantly reduced.