This turned out to be a lot longer than I thought it would be when I started. So I want to preface this by saying kudos to you for making this and it is certainly a lot more than I have ever done (and probably better done than I would have). Please take all of the following as constructive criticism and feel free to implement or ignore as you see fit.
A criterion I would add to the privacy score is whether or not the password manager is open-source or closed-source, with points being given for being open-source (personally I consider this a top criterion for security apps). More points should be given if the password manager is regularly audited by independent 3rd parties.
Another criterion I would consider is if the password manager is the only product made by a developer or part of a suite of products they offer (whether or not related to password management and security). The reason is if the password manager is part of a suite then its development must be balanced against the resources and priorities of the other products.
Personally, I wouldn’t factor in Data Breach Alerts as those are easily available elsewhere and more of a convenience than a password manager function (to be fair I’m a little salty as it is dragging down my preferred password manager Bitwarden who is apparently the only one not to offer it). I would reclassify it, along with VPN, file storage, and other not-really password management features (such as Bitwarden’s Send feature or ability to generate TOTP authentication codes) as miscellaneous or bonus features and then I guess quantify how useful you think they are (which is of course totally subjective) or don’t quantify them at all and just let people know they are there.
Something else to look for is if the password manager has backup/export functions. Can backups be generated encrypted and unencrypted? Can it import/export to/from other password managers?
Can you access the password from a web browser (not using an extension)?
Does the password manager have a password generator? If so can it also generate passphrases? Can it generate logins and integrate with services like addy.io to anonymize your email address?
I would also note which password managers support the superior Argon2 key derivative function (KDF) as an alternative to PBKDF2 and give weight to that. Ideally, Argon2 should now be the default KDF when setting up a new account. I would rank this in your privacy score (more on this in a bit).
Password sharing and passkeys are not the same thing. For instance, Bitwarden does support password sharing but currently does not support passkeys (passkeys should hopefully be supported within the next month). I would separate them into two different criteria. Right now I wouldn’t weigh passkeys too highly as it is very new, and not widely supported across the Internet yet (and will probably be a bit before they are if widely supported at all). Mostly I would want to know if the password manager plans to support them if they don’t already.
I would note which browsers they have extensions for - specifically Chrome, Firefox, Edge, and Safari. Since almost every other browser uses one of those engines (most of them being Chromium) it can probably be assumed they will be supported whether listed or not.
I’m a little confused by what you mean by “service is using more than 2 authentication factors”. Do you mean it supports using more than 2 steps during login or has multiple types of 2FA methods? For instance, you gave Bitwarden a 3 even though it supports FIDO2 Webauthn, TOTP (authenticator apps), email, as well as security keys and DUO Security through its premium tier. Meanwhile, you give NordPass a 5 even though it only offers security keys, TOTP, and recovery codes (which technically Bitwarden does as well if you consider that 2FA method). Bitwarden also supports passwordless login with a device (ie a passkey for Bitwarden) which by default is 2FA (although not two-step) login whereas NordPass currently does not (they are working on it).
Continued…