@abhishek
Very good question!

The reason I didn't mention Duckduckgo is because it isn't counted as free software, more like freeware.

There have also been troubles over time like data getting sent after favicon change on mobile and bad things like that.

Even though they are better than Google, I feel DDG as a profit-motivated "private" search engine(e.g. ads on by default).

I prefer not to use it.

Ask me any questions and Stay Safe!