Sometimes people didn’t have the keywords. Once they got the keywords, they might find they already knew it and needn’t an extra googling.
Sometimes people love communications.
Sometimes people don’t want google to track them.
Sometimes it is just because it is free.
And I googled your question for you if your sentence is a question.
https://meta.stackexchange.com/questions/31104/why-do-so-many-people-ask-basic-questions-instead-of-searching-first