Exactly. Apple isn't just promoting ad blocking for purely benevolent reasons i.e "for the best web-browsing experience possible" - they obviously have other motivations.
"Providing the best web-browsing experience possible" isn't a benevolent act, anyway. Another way to say it is "making the most appealing-to-use software so your customers will buy your device instead of someone else's." Providing a better web-browsing experience makes Apple money.