You’re missing the fact that Google is both the company behind the most popular browser used to access content on the internet and the most popular website on the internet. Their browser says incognito mode offers protections that their website then runs roughshod over. They’re the perfect company to sue over this because the website can’t shift blame to the browser and the browser can’t shift blame to the website.
One really simple answer: people of popular-music-making age in the ‘60s and ‘70s were worried about getting drafted into a useless war. Sure we have plenty to be upset about, but the visceral threat of you or those you care about getting shipped off to ‘Nam was fertile ground for protest songs to become a major chunk of that era’s pop music.