Watch out with doing more complicated searches like extending those to a date range - they get people “banned” from using google search.
Also it's funny how they lie about having about a quadrillion results, and then when you're on page 12, suddenly that's all the 150 results they have, sorry.
I have not hit captchas very often. Even IP bans only last hours. It is annoying, but low risk. I do searching from shell prompt, never browser.
What always amazed me about Google is that they are not willing to let users to skip pages 1-11 and immediately jump to, say, page 12.
Sometimes queries are non-commercial and there are no ads. Still, jumping straight to page 12 can trigger a captcha.
I wrote a script that reverses or randomises the order of Google results, as an experiment.
I was doing some deep searching in very specific date ranges with lots of modifiers and google gave me the "your query reminds us of bots or some shit try again later" and I had to stop because it wouldn't let the queries through anymore. Is that what that was?
I've encountered Google ReCaptcha as well a few times when searching from a logged out browser.