Emily Sundberg on WWDC fashion, the Substack competitive landscape, and the death of the celebrity brand era
Jun 13, 2025 with Emily Sundberg
Key Points
- Celebrity equity brands are collapsing as audiences recognize the founder-celebrity illusion; replacements include paid appearances at $400,000 and pure angel investor structures without operational claims.
- Substack's 10% cut and discovery moat lock creators in, but the platform lacks native advertising, forcing writers to independently sell sponsorships and rely on cross-promotions for growth.
- GLP-1 adoption is reshaping consumer behavior as a chemical shift rather than a brand moment, creating downstream opportunities in protein supplementation and therapy while leaving fast food viable at smaller portions.
Summary
Emily Sundberg, writer of the daily newsletter Feed Me, offers a ground-level view of how Substack's competitive dynamics, celebrity brand fatigue, and GLP-1 adoption are reshaping consumer culture and creator economics.
Substack Is a Lock-In Platform — and That's Not a Bad Deal
Five years on Substack, publishing daily, Sundberg has built one of the platform's most active reader chats. A DC-based investor reviewing her analytics told her bluntly she could not afford to leave — discovery within Substack's ecosystem is too valuable. She accepts that trade-off. Substack's 10% revenue cut, she argues, is fair given that in-platform growth likely exceeds that percentage. The critical structural gap is advertising: unlike Beehive, Twitter, or YouTube, Substack has no native ad integration, forcing creators to sell sponsorships independently or through an agency. Cross-promotions and newsletter collaborations are currently the primary growth lever for most writers on the platform.
The Celebrity Brand Era Is Effectively Over
Consumer sophistication has eroded the equity-heavy celebrity brand model. The formula is now too transparent — audiences understand that a celebrity holding 30% to 50% equity in a brand built around their name is not an operator. The illusion of founder-celebrity has collapsed. Two alternative models are emerging: a return to straightforward paid celebrity appearances (Sundberg estimates around $400,000 for an ad placement), or a cleaner angel investor structure exemplified by Saquon Barkley, who takes equity stakes, appears in ads, but does not claim to be building the company. Sundberg sees the angel investor identity already spreading into influencer culture, with the designation appearing in Instagram bios as a status signal. The Alex Earl and Poppy deal is the clearest recent case study — her father negotiated equity in the brand, giving her economic alignment without the pretense of operational involvement.
WWDC Fashion Signals a Generational Shift in Tech Culture
Attending WWDC on Monday June 9th, Sundberg observed that the archetypal hoodie-and-New-Balance developer aesthetic is fading. Attendees skewed toward considered fits, premium sneakers, and high-end watches — including at least one Patek Philippe Nautilus spotted on the floor. Will Welch, editor of GQ, was also present. Sundberg attributes the shift to younger developers for whom WWDC is a marquee annual event worth dressing for, displacing an older cohort of Steve Jobs-era style adherents. On Apple's announcements, Twitter sentiment during the keynote read as disappointed, but a post-event developer barbecue told a different story — app builders were enthusiastic, particularly about moves that could expand independent developer ownership of AI-native apps.
GLP-1 Ripple Effects Are Still Playing Out
GLP-1s are, in Sundberg's view, the dominant force in wellness right now, operating less as a branding opportunity and more as a chemical behavioral shift affecting how people eat, socialize, and exercise. Fast food brands are not necessarily doomed — users are still consuming, just in smaller quantities. The Pilates studio business remains insulated; Sundberg compares its proliferation to dispensary expansion, with low-cost reformer machines enabling new entrants constantly. A potential downstream opportunity she flags is protein supplementation for GLP-1 users eating less overall, though she notes questions about whether high-protein processed foods are genuinely therapeutic. A therapy demand surge is another expected second-order effect as users navigate appetite and body image changes.
Feed Me's Sourcing Model Is Reader-Driven and Defensible
Sundberg's competitive moat is her reader base, which routes tips to her that could go to New York Magazine, The New York Times, Puck, or Semaphore. She also runs an anonymous tip line and goes out four to five nights a week to maintain a live intelligence network. Copycats no longer concern her — she relies on platform data as her benchmark, and the numbers are sufficient to close the conversation.