I'm always a little confused by this claim. Focusing on revenue-generating products and not the user products they use to sell them: Google Search was their first success, then AdSense (third-party display ads), then YouTube. The latter two each make almost $30B/yr (run rate). Ignoring ads, Google Cloud makes >$20B/yr, as do Google hardware sales, with an additional $30B/yr from "non-advertising Other".
I don't really understand how one supports this claim without using decidedly non-standard definitions and grouping of revenue. If you insist on lumping together separate, wildly-successful revenue-generating products into overbroad groups by the manner in which the revenue is collected, and ignore a couple of objectively enormous revenue streams: Do you similarly feel that Apple "hasn't found a second gold vein" beyond "hardware sales"?
I don't really understand how one supports this claim without using decidedly non-standard definitions and grouping of revenue. If you insist on lumping together separate, wildly-successful revenue-generating products into overbroad groups by the manner in which the revenue is collected, and ignore a couple of objectively enormous revenue streams: Do you similarly feel that Apple "hasn't found a second gold vein" beyond "hardware sales"?