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The co-founder and chief executive of Signal has resigned.
It was a good time to replace myself as CEO after working on Signal for over a decade.
Some users are concerned about the recently enabled payments within the app.
The board's executive chair, Brian Acton, becomes interim chief executive, while Mr. Marlinspike remains a board member.
Mr Marlinspike had always wanted to reach a point where Signal could grow and sustain itself beyond his involvement.
He wrote that he was the only person on call for the service, was facilitating all product development, and was managing everyone.
I had to take my laptop with me everywhere in case of emergencies, and sometimes found myself sitting alone on the sidewalk in the rain trying to diagnose a service degradation.
More than 40 million people use Signal.
The app's popularity went up after some users switched to another app.
It's free, and the messages are automatically protected.
Mr Marlinspike's skills as a programmer have helped both Signal and WhatsApp.
The Signal Protocol was integrated into several other instant-messaging apps, as he developed it.
While Mr Marlinspike's tenure as chief executive has seen Signal grow in popularity, a recent experiment with cryptocurrencies has caused some users concern.
In November, the app rolled out to all users a trial of an integrated payment system using a cryptocurrencies called MobileCoin, which claims to be both highly secure and eco-friendly.
The start-up has reportedly received technical advice from Mr. Marlinspike.
It is said that integrating a currency into an app is a risky strategy that could lead to criminal misuse of the app and put it within the scope of financial legislation.
The addition of pseudo-anonymous money-transfer functions greatly increases their legal attack surface, while creating the possibility of real-life harms, according to Alex Stamos, formerly Facebook's chief security officer.
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The new leader of the secure-messaging sector is also a veteran.
Mr Acton left the messaging app, which he co-founded, in 2017: it had been sold to Facebook in a deal worth $19 billion.
Differences in the use of customer data and targeted advertising were cited as reasons for his departure.
The Signal Foundation received funding of $50m in the year 2018, with the help of Mr. Marlinspike.
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