It was a big threat on Windows on ARM which only allowed you to install applications from the windows store or use an extremely slow x86 emulation layer. Microsoft blocked any browser from the windows store that was not based on the edge engine so Edge was the only usable browser available on ARM because emulated browsers simply cannot compete. Of course in the end it never went anywhere and even Edge's engine is about to be replaced with Chromium.

Nowadays Windows on ARM is basically the second coming of Windows RT, a massive failure. The biggest difference is that this time they decided to not produce a million devices too many.