But while we're speculating on how the domain the appears at the top of the list, let me hazard a guess...
Philosophy.com was registered in 1999 and according to waybackmachine, has been selling cosmetics on the site since 2000 (20+ years). The company sold in 2010 for ~$1B to a holding company with revenues of $10B+ today (Unfortunately I couldn't find how much it contributes to that revenue). According to Wikipedia, the Philosophy brand has been endorsed by celebrities, including "long-time endorser" Oprah Winfrey, possibly the biggest endorsement you could get for their industry/demographic.
I think it is a long established business, with strong revenues and there's more people online searching for cosmetic brands than for philosophers.
In the same way (admittedly in the extreme) when I'm researching deforestation and I query to see how things are going for the 'amazon', the top result is another successful company registered pre 2000, with strong revenues that most likely attracts more visitors..