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Re:WhatsApp loses millions of users after terms update by vel0city on Monday January 25, 2021 @10:40AM (#25904418)
Signal now has video calling through their desktop application.

(a) its actively maintained (b) unsure about requirements of "standalone service", but its stand alone as its only a chat service (c) its just a messaging client, no calendar/meeting kind of stuff

Other than that I've had good success with web-focused services like Google Meet and Jit.si. There isn't a desktop app but to an extent that's been a win. All you need to do is email/text a link to your chosen friends and its all in their browser using web standards (or semi-standards, no plugins at least for modern FF/Chrome/Edge). No accounts, assuming they have a modern browser there's no software to install, just click and go.

Re:WhatsApp loses millions of users after terms update by m000 on Monday January 25, 2021 @01:15PM (#25906595)
Thanks for the pointer to the Signal desktop app! It looks pretty close to what I had in mind.

As for the definition of a standalone service: One that doesn't tightly integrate with other offerings/ecosystems. Skype is kind of ok because other than connecting with your MS account, it doesn't promote other offerings. Also Microsoft's business model is not based on collecting and selling your data, at least not in the same extent as Google/FB.

Web-focused services work ok if you're comfortable with the web. But for parents, grandparents etc., I feel that a standalone client with a simple interface is more foolproof.