Not really. I've been in that situation, and spammy recruiters are just looking at "Oh, he's got $buzzword in his profile, and $company needs $buzzword!" If $buzzword = bash, that's not really useful. It's used everywhere, and isn't really an exclusive skillset. They don't pay attention to company culture, pay, or even location.

Obviously YMMV, but IME, they pretty much just throw everything against the wall, to see what sticks.

But I don't feel like any of it is authentic. Submitting my resume directly to the company would probably accomplish the same thing.

In some cases, that might even be true.

Not when they all for your resume, then turn you down because you only know Chef, not Chef, Puppet and Ansible.

Now only if LinkedIn had made it recruiters' emails an opt-in.

Not when 90% of them aren't even local.