What a program does at the moment is exactly what it should do, unless there's a bug report filed, or the current developers want it to do something else.

Whatever it was originally meant to do is probably either obsolete, or well known to all users, if it's been so long the original devs left.

If it's got ZeroMQ, and has for 5 years, one can probably assume someone will be upset if it suddenly does not have ZeroMQ.

Regardless of intent, for practical purposes, if people are using it, they probably want that to stay around until you do an orderly transition to some other thing.