Does `inetd` (and `nc`) apply only to programs written as daemons?

When inetd makes several programs run as services, does inetd require the programs necessarily written as daemons (e.g. not having a controlling terminal, no interactive input, ...)? Or caninetd daemonize nondaemon processes, similar to what setid can do? By the way, same questions for nc, given that https://unix.stackexchange.com/a/500646/674 Thanks.