I mean, Apple is at the point where they're designing multiple custom chips: a general-purpose CPU (A12X), a SiP (S4) an ARM SoC (T2), a wireless-focused SoC (W3), and an audio-focused SoC (H1).
Is Intel not a "mega tech company"? They have 75% the market cap of Microsoft, and virtually all of their revenue is from producing silicon.