Basic users have a three device limit as of March 2019.
Plus and Professional users can link unlimited devices.
Similar to Evernote, Dropbox now limits the number of devices you can sync your files to.
Dropbox have said they’ll honour existing device registrations for free users with more than three devices, but if you accidentally deregister one it wont be allowed back.
Clearly a change (made very quietly) to entice users to start paying for the service, but could the move mean the company ends up in a similar position to Evernote?
I was already looking at alternatives; this could very well be the nail in the coffin.
Source: Is there a limit to the number of devices I can link to my account? – Dropbox Help