In theory, the tag server is about
a computer program running to serve the requests of other programs or a physical computer dedicated to running one or more such services.
The first meaning (a computer program) is a useful one: there are many questions about server programs. The second meaning (a computer dedicated to running server programs) is not: hardly any question is specifically about server computers. In practice, the tag server is mostly used to mean “the computer where I'm having this problem doesn't have a console”, which is just as useless information as the color of the shirt that the asker is wearing.
For the first, useful meaning, daemon is fairly similar. So there's no use in trying to enforce the meaning of server.
Stack Overflow got rid of server
multiple times, as did Server Fault and Super User.
Let's just get rid of server.