[ss48]

In most cases convenience. Sometimes, you may need to share a password one-off (ex. https://support.1password.com/share-items/) with a coworker or a friend. Setting up something like that with keepass is not really possible.

If you want to manage passwords amongst family members, it's easier to set them up with one of the cloud services compared to Keepass. You also get some level of customer support, and don't have to worry as much about when your password breaks.

I personally have set up KeePass, made sure it's backed up regularly, and even set up a WEBDAV server to access it remotely. It works great for me, but I know how everything is set up. Strongbox for mobile access is the main reason I can actually use this, and this is a paid application that not everyone is willing to pay for. Experience-wise, other mobile applications for KeePass have not compared, and I have no idea how apps for Android compare, since I set up everyone with iOS devices. Sometimes, the connection to the server gets disrupted, and I have to reconnect. Not everyone wants to do this, and can have less confidence in the other supporting infrastructure.

As much as attack vectors exist, the biggest risk is you losing access to your own passwords (there's been enough lost crypto wallets you can read about on the internet). Compared to that, a cloud based service is better for a large group of people.