Because my paid Bitwarden account works for every single device I own, for every app I use, for every website I visit, and for every browser that supports plugins. I can host it myself if I need to. I can have a family account to let my wife login and have her own separate passwords on the same sites as me. I can tag and sort and regenerate my passwords seamlessly. I don't have to come up with my own passwords constantly -- just click a few buttons to generate one within the current site's requirements, and hit "save".