I wholly disagree. Even if the results are depressing (and they can be depressing for people at those companies who see the ranges that others at their same level make -- maybe even more depressing), it's so important to have information when negotiating for a raise or for a new position.
Information is power and it is in companies of all sizes best-interest for workers not to discuss wages. That's fine -- I understand why from a business perspective, the corporation doesn't want to share this information.
But for workers, this information is extremely important and it should be discussed. Sadly, it often isn't because of cultural/social norms that deem talking about money "rude" and because plenty of people are embarrassed to admit they make more/less than their peers.
But it's important we know this information. This is even more true for underrepresented groups, who historically are worse at negotiating and get paid less as a result -- and may not have the networks to know what they should be asking for/expecting.
When I worked in media (where the pay is considerably different than tech), I used to ask more junior co-workers that I had a good rapport with what they made -- not to be nosey -- but to help them negotiate better. It took me a long time to figure out my own worth and ask for it.
AND STILL, even knowing this, I fucked up when I switched careers because I knew how much I was worth in my old career, but not in the new career. Glassdoor only goes so far and until you're in the system, you don't understand the intricacies. I stupidly didn't negotiate my offer -- in part because it was substantially more than I made in my old career -- but I'm underpaid -- compared to my team members at my same level and got a shittier sign-on/stock package as a result. That sucks for me (and it's 100% my fault. I don't blame the recruiter in the slightest), but the more data I can gather about what the mean -- or even median -- is for my company/position, the better I can negotiate in the future, either at my current employer or somewhere else.
Knowledge is power and having resources like this -- even if they carry an implied asterisk because of things that charts like this can't necessarily account for (division of a company, demand for certain skillsets, area of expertise, etc.), I'm glad stuff like this exists.
It's certainly better than looking at Blind, where most of the posters are quasi-sociopaths and liars with negative intentions.