May I ask (in good faith) how you know what the real "truth" is? I would totally believe Glassdoor is a bit low. Levels.fyi, which I didn't know about but just

May I ask (in good faith) how you know what the real "truth" is? I would totally believe Glassdoor is a bit low. Levels.fyi, which I didn't know about but just checked, seems really high. I believe both are based on real data points, but is there any reason to believe either is a better reflection of the actual numbers? (My relatively poorly-informed speculation is that Glassdoor is using old/irrelevant statistical data while levels.fyi is suffering from some pretty extreme selection bias being a comparatively obscure site relying on self-reporting.)