While this is all somewhat interesting, I'm not sure what the point here is - all of these things seem to be reasonable things to do?
What I understood the GP post to be is that the owners of the browser do shady stuff, which I found no evidence for on Google (or DDG). So was Opera compromised by a third party or is Opera compromised by the first party (malicious owners?).
[0]: https://github.com/search?q=org%3Amozilla-services+google&ty...
That's hardly an excuse when you want to differentiate on privacy, is it?