It's a lot more complicated to crawl code somewhere in the web than to crawl github.

They could even change github so it benefits their code crawling.

That would be a problem if Microsoft didn’t also have their own Bing

Oh, is Bing still a thing? Honest question, haven't heard it mentioned for years. Went from Altavista to Google (I believe, it's a long time ago...) and now to DDG a couple of years ago. Never considered Bing directly although I believe DDG results come or came from Bing.

Yes, Bing still exists. Like you say, that's where a lot of DDG results come from.

Maybe they have a stronger position because they own GitHub. There is at least "Release and Indemnification" section in the terms of service.