Removing write/modify access of the logged on user to the widevinecdm has seemed to stop the update of 4.10.1146.0 to any higher non-working version. I've had the browser open for over 2 hours playing Netflix and it usually updates by now to a higher version but has not done so since the permissions changes.
In case anyone cares to follow suit.
Not sure how this is going to affect overall functionality, however, since I've noticed nothing out of the ordinary and I've only change permissions on the wide-vine directory and not the whole profile directory I think I'm good.
@buss Vivaldi does not ship with Widevine; it downloads it after installation and it should download automatically. If it doesn't, just go to vivaldi://components and click the "Check for update" button.
I can confirm that this works with a new/fresh Vivaldi 2.0 installation.
Also, I can't stress this enough: DO NOT downgrade to older versions of Vivaldi... and definitely DO NOT install any Vivaldi 1.x releases on macOS as a workaround for ANY issue after you have installed Vivaldi 2.0. Vivaldi releases are not backwards-compatible and downgrading will likely corrupt your Vivaldi profile and cause other problems that can be difficult to recover from.
Same NETFLIX problem here, but WidevineCdn says it is up to date.
Netflix error: M7701-1003
Vivaldi: 2.0.1309.37 (Stable channel) (64-bit)
Windows Home 10, version 1803
WidevineCdn: Version: 4.10.1146.0