Na, my experience is that Defender is fine with users downloading browsers and “updates” from random Russian sites. It’s happy to let the users install that software and only bothers to log a “hey, maybe this was bad” alert some time later. Edge, on the other hand, loses it’s shit when you visit the official download sites for Chrome or FireFox.
It may be a case of laziness which has started creating a local dialect. This is one of the ways living languages change over time, people start sluring words and sounds together until there is almost nothing left of the original words and there is a new word in their place.