At last Apple implemented a decent clipboard history. KDE has this thing for a decade now, I guess...
KDE also can encode entries as QR codes, so you can make URLs transferable to your phone or whatnot.
-- Sent from my MacBook Air.
CopyQ works for forever history for me, it also doesn't save copied passwords, which is nice.
How does it detect passwords? Usually those are just plain-text when copied.
Either way, I think it is better to not copy passwords to the clipboard or the selection, but store and transfer them via password-manager/browser/etc APIs.
If you use KDE Connect, your clipboard history immediately goes to your phone's clipboard :)