Growth channels
Growth channel decisions — when founders doubled down, when they killed a channel, and what the numbers said before and after.
From the curated library
Ask the Directory -- Sign up to accessOpenAI: Launch ChatGPT as a free research preview (2022)
OpenAI released ChatGPT as a free web app in November 2022, making GPT-3.5 accessible to anyone. Rather than gating behind API pricing or enterprise sales, they let the world use it for free — a massive bet on viral adoption over immediate revenue.
Google had dominated AI research but kept LLMs internal. Meta released LLaMA as open weights but without a consumer product. Anthropic and Cohere were API-only. OpenAI had been selling GPT-3 …
ChatGPT reached 100M users in 2 months — the fastest consumer app adoption in history. It triggered an AI gold rush, with Microsoft investing $10B and competitors scrambling to launch rivals. OpenAI's revenue grew from ~$30M in 2022 to $3.4B+ in 2024.
WeWork: Aggressive expansion with long-term leases (2015-2019)
WeWork signed 15-20 year leases on premium office buildings globally, betting that demand for flexible workspace would grow faster than their fixed costs. They expanded to 800+ locations across 125 cities.
The gig economy and startup boom was creating massive demand for flexible workspace. Freelancers, remote workers, and startups didn't want 5-year office leases. SoftBank's Vision Fund had $100B to deploy …
WeWork filed for bankruptcy in November 2023. The long-term lease obligations became unsustainable when occupancy dropped during COVID. The company went from a $47B valuation to bankruptcy. A cautionary tale of growth-at-all-costs without unit economics.
Dropbox: Referral programme — give 500MB, get 500MB (2008)
Dropbox created a double-sided referral programme where both referrer and referee got 500MB free storage. This was a distribution bet — using existing users as the growth channel instead of paid advertising.
Dropbox had tried Google AdWords and was paying $233-388 per acquired customer for a $99/year product — the economics were disastrous. Meanwhile, PayPal's referral programme ($10 for referrer and referee) …
The referral programme increased signups by 60% permanently. Dropbox grew from 100K to 4M users in 15 months with virtually no ad spend. The programme became the most cited example of viral growth mechanics in SaaS history.
HubSpot: Inbound marketing methodology as distribution (2006)
HubSpot coined 'inbound marketing' and built a massive content machine (blog, tools, certifications) as their primary distribution channel. Instead of outbound sales, they attracted customers through educational content and free tools.
Google's algorithm was rewarding content-rich sites, and blogging was exploding (WordPress had just made self-hosted blogging accessible). Traditional outbound marketing (cold calls, trade shows, direct mail) was becoming less effective …
HubSpot's content engine generates millions of monthly visits and is the primary lead source. Revenue grew to $2.2B by 2023. The inbound methodology became an industry movement, with HubSpot Academy certifying hundreds of thousands of marketers.