Of course, somebody in the neighborhood is stapling up posters today, looking for his lost black cat...
LOL! Too true.
Cats are like that. Not all, but many cats go from home to home as it pleases them and as they find friendly people and good eating. I've had dozens of cats, and their loyalty is not unwavering. I've had cats disappear, only to come back a few months later like it's no big deal.
Right now I have no cat or dog, because pets are not allowed where I rent. But there is a well-fed solid black male cat who comes around just for a visit. He doesn't need to be fed. He just makes the rounds, staying a night here, a night there. No collar or tags. He is not feral at all, used to being pampered.