Definitely think that it would have been a good tool to counter fraud/abuse. The issue of course would be that abuse of said tooling and the rise of ad-tech is what's caused the major issues we see today. I'd imagine that it would be useful to perhaps, flag accounts that were created on the same machine as a tool to help detect when users are trying to circumvent abuse control tools.

Sure, someone can create another account using a new browser, within a VM, from another computer, inside a VPN. It's all about making it much harder. If the primary use of fingerprinting was to protect community from bad actors, like those violating a set of community guidelines, then maybe the extra effort it would take to get around those issues might give them enough time to diffuse.