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WhatsApp seems set on introducing ads, but they won't appear in your inbox
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
As Signal is open source, I guess someone could just fork it. It's not like anybody is really using it en masse as it is, and the kind of people who use it at the moment are also exactly the kind of people who would be happy to migrate to another service if they had a reason to.
Literally everyone in the UK uses WhatsApp, including 100% of my own extensive contacts. If I could download an open source rival app and still have full interoperability with WhatsApp users, I'd do it in a heartbeat. I've got Signal installed on my phone, but it's basically pristine and unused due to the lack of people to talk to. What's another app for the pile?