Market momentum probably. People "Google" things. People don't "Kagi" things or "DuckDuckGo" things.

I question why Instagram is so popular. I don't use it but my wife does and she constantly runs into errors and bugs. It's a multi billion dollar company and suffers from the sort of issues that beta software does.

They got to their position first, got the market share and then enshittifed from there.