Because Jetbrain strategy wasn't to burn money with free tools to eventually exit with the jackpot. They have been profitable for over a decade, simply asking users to pay a fair price for great product.
Never did. I remember someone replied to my comment here that Google isn’t paying a penny to JetBrains. They’re quite happy with the relationship primarily because they don’t have to pay anything. If anything, JetBrains is the one who needs Google more than the other way around.