> That might not be legally relevant but it is certainly ethically relevant.

I don't know if it's ethically relevant. I'm sure there was someone named Matt Damon before the actor Matt Damon, and maybe that guy was even an actor, but I wouldn't say today's Matt Damon is ethically violating ancient history's Matt Damon.

What is the right rule for abandonware? It can't be, whoever got there first. Anyway. I don't buy your timeline. Redis-rs comes after the name Redis, certainly, which these guys now own. It doesn't matter when these two events you picked out of a hat occurred.