Episode 74 of The Big Tech Podcast examines a trend that's reshaping the internet's backbone: the big five tech companies are increasingly building their own private network infrastructure instead of renting from telecoms. Lucas and Luna look at why Apple, Google, Microsoft, Amazon, and Meta have collectively spent over $20 billion on undersea cables, fiber rings, and dark fiber leases in the past two years. They unpack two specific case studies — Meta's 20,000-mile undersea cable project that connects 16 countries, and Google's private network that now carries more traffic than the public internet in some regions. The hosts also tie the trend to this week's sell-off in big tech stocks (down 6-7% in the last five days as of June 26, 2026), asking whether investors are underestimating these capital-intensive long-term bets. No clickbait, no hype — just a clear look at how the physical infrastructure of the internet is being privatized.