Acton made Signal unsellable by turning it into a nonprofit

Brian Acton co-founded WhatsApp in 2009 and built it around an explicit anti-ads, pro-privacy pitch to users. Facebook acquired WhatsApp in 2014 for roughly $19–22 billion, and Acton stayed on through the transition — but watched Facebook begin pushing WhatsApp toward the ad-supported, data-linked model he and his co-founder had spent years telling users they'd never build. He left in September 2017, reportedly forfeiting close to $850 million in unvested stock by walking away before it fully vested, rather than stay and implement the changes.

Acton didn't try to build a new messaging app from scratch. Signal, the encrypted messenger built by cryptographer Moxie Marlinspike, already had the technical credibility and the user base Acton wanted to protect — what it needed was a way to guarantee its independence couldn't be undone the same way WhatsApp's had been.

Acton made Signal unsellable by converting it to a nonprofit with no equity to acquire, so no one could ever buy control.

Eliminating equity means no share price for acquiring control.

A structural fact (no shareholders) survives leadership changes and market pressure.

The 2021 WhatsApp backlash drove users to Signal, proving the structure's trust value.

To protect a core value, remove the mechanism that lets someone break it—like equity—rather than relying on promises.

When WhatsApp announced a 2021 privacy-policy update widening data sharing with Facebook, the backlash sent users to Signal in numbers no marketing campaign could have bought: Signal's Android install base jumped from roughly 10 million to over 40 million in a matter of days, with tens of millions of new signups overall, after high-profile endorsements including Elon Musk's 'Use Signal' post — a surge Signal's own servers initially struggled to handle.