In our bubble yes, in the real world...not so much.

I often have to remind people here that not everyone in the world is a software developer. Yahoo may have less of its markets but the markets it's in are substantially larger.

I assure you, considerably more people have heard of Yahoo than have heard of GitHub. The software engineering bubble isn't as big as you think.

What kind of impact? Yahoo unfortunately has a lot of impact from their news service. It is crap news IMO but a lot of people are into clickbait.