Alex Stamos, Facebook’s former chief security officer, who left the company this summer to take up a role in academia, has made a contribution to what’s sometimes couched as a debate about how to monetize (and thus sustain) commercial end-to-end encrypted messaging platforms in order that the privacy benefits they otherwise offer can be as widely spread as possible. Stamos made the comments via Twitter, where he said he was indirectly responding to the fallout from a Forbes interview with WhatsApp co-founder Brian Acton — in which Acton hit at out at his former employer for being greedy in its approach to generating revenue off of the famously anti-ads messaging platform.

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