I personally do try to pay for standalone services if they're high quality and secure. You mention other services knowing things about you, and that's absolutely true, but there's a difference between them being the product and you being the product. Dropbox charges and makes money off of you, they're not exchanging your personal data to stay afloat.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.