DO NOT USE RUBIK ... in case you value customers with old machines.
There are several reports here in the forum with websites somehow not displaying correctly, text not showing up, etc ...
and it all boils down to a problem with the font "Rubik" in general on older machines (Win7, 8.1, maybe older Android WebView components, ...)
See the github issue here: https://github.com/google/fonts/issues/1137
State: Currently no solution. No explanation.
So in case you might expect customers with older machines in your shiny new shop, there is only one solution:
DO NOT USE RUBIK