I'm confused.
A clipboard is different to notes.
For notes, you can use Apple Notes, or Google Keep etc...
If I just want to copy anything and paste anything on any device, that's not a note system.
However you can use a note system to manually do this, but it is a copy paste on source device, wait for sync on target device and copy paste on target device.
This is a manual process, which I'm already doing using Google Keep, how is this different?
How is it different to KDE connect, which does have a universal clipboard, but you have to run the app in the foreground for it to work and it doesn't work without tweaks and severe configuration and requires all devices to be on the same LAN ?