Lies, damned lies, and #webrtc statistics!

Recurrently, people are arguing on different webrtc mailing lists or social sites. Some questions are still left open: which MCU/SFU is better, which PaaS is better, should one work on webRTC in Safari? in Edge? Usually some kind of statistics is being used. While it is well known that you can make statistics say whatever you want them to, I do not always see reason to argue. Indeed, most of the time people argue about different use cases that are not opposed to each other, or implicitly define different scopes that do not overlap. I thought it would be good to clarify things a little bit by presenting several trustable source of data for browser usage, webrtc support, and define a view usual use cases for illustration.
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