I personally find that 90% of the responses I get to salary requests are:
"I would love to chat to you on the phone about this on the phone with you!"
"How dare you ask me that, you should be thankful for me even writing to you with this incredibly vague offer in the first place."
I tried responding to ~20 recruiters with a copy-pasted question about salary, and none responded with anything even close to a salary range, only the responses above.
Needless to say, I have simply given up responding to recruiters at all.
I have a similar approach that works well, you just need one more filtering step.
Anyone who reacts negatively to the salary request, you ignore and move on. Don't even bother replying.
For the "lets hop on a call" folks, I have a second copy-paste that just politely states that my schedule is tight between interviewing and my day job and that I want to ensure a reasonable fit is possible before investing a lot of time.
Anyone who _still_ hasn't given a clear answer after those 2 tries I stop replying to.
To be clear, well north of 90% of inbound linkedin recruiters will fail this test, but I've found it to be a surprisingly low-effort way to separate valid opportunities from uninteresting recruiter spam
There are a few that are worth dealing with, and a large number that aren't. When you stumble into the few, even if you aren't looking, take note of who they are. You may want them later.
I respond to most recruiters now that I won't even talk to them without a salary range. And then they send it right over.