Do you have an add-on such as uMatrix on your browser(s)?
Click on a video on invidio.us and then check that the media column on uMatrix is green. You might have to enable it on googlevideo or on invidio.us itself. If you go to settings and change the quality to dash, then invidio.us will fetch the video for you and you won't have to deal with getting any media from Google.
If you have NoScript as well, then you might have to enable invidio.us scripts to run. LibreJS recognizes them as libre so there should be no problem in running them in terms of freedom.
