I've got a lab for stuff I want to tinker with, but a password manager is seen as an "essential service" to me like e-mail and music. I'd much prefer to pay a bit per month and have a team of professionals deal with it if the servers go down.
If at the end of the day my home server breaks and I want to get on and watch Amazon Prime/Netflix/whatever I still can with a hosted password manager. I value my time and sanity a lot more than £2 a month.
Currently doing just that, if any of my servers go down, i can still access all of my passwords on my desktop, on my laptop, on my tablet, on my phone or on my backup servers. Of course, provided that i have KeePass or a mobile app installed and know the master password.
Oh and I do manual backups to SD cards just to be sure every month. I'm not sure how I'd do that with a cloud service where in a sense their entire company (and my network connection to it) is a single point of failure. If my internet connection goes down, how would I log in to my selfhosted software in my homelab over LAN, without being able to access the passwords?
Potentially. Are you looking to make a prototype, or are you trying to go to prod with mission critical data?
Most people here could trivially roll a prototype grade password manager in pretty limited time. Getting something hardened and reliable is a different story.