Apple salaries aren’t much of a secret, see: levels.fyi. 1M is a lot of money to me, a regular person, but when you consider that top security engineering talent could be making north of 500k in total compensation, 1M suddenly doesn’t seem all that impressive. It’s a good bet to make on their risk. Imagine paying a mere 1M to avoid a public fiasco where all of your users get owned. This just seems like good business.…
I'm surprised by how cheap the vulnerabilities market is. A good exploit, against a popular product like Chrome, selling for 100k or even $1M may sound like a lot, but it's really pennies for any top software firm. And $1M is still a lot for a vulnerability by market prices. You can do so much damage/return with an exploit that affects > 30% of the population. Get 5 of those and sky is the limit.
I presume that it is a legal minefield, selling 0days and extortion are first cousins, at least. If you could hold a bid, no doubt an Arab country would pay $50 Mil for one...but they buy them from companies that sell "software" and services.