Yes, I did read up a lot about password security the last few years. But still, I'm worried a very secure policy restricts people from registering at all, see case above. What would you say is a good compromise?

Another thought I have discussed a lot is, this app is not something critical. It's not online banking, it saves very little about you (as little as possible), etc. - so what does this say about the compromise? If an account was to be compromised, an attacker would only have access to the todos, music, notes of a user. Now, todos and notes could be very telling, but I'm unsure about how much of a responsiblity I have as an admin to save users from this? Do you know what I mean?

Yeah I understand. I think my point is don’t add any other friction to the password strength other than length. If you want more security increase the min length, if you’re happy with less, lower it.

I’d personally have a 12 length password enforcement, a password strength meter and nothing else. Possibly less if you introduce 2fa.