Ultimately I don't think this is what OP is saying. Just that white boarding leetcode/hackerrank algos isn't the best use of time, but I'll respond to the takeaways nonetheless because I have spent a lot of time on them:

1) By what metric? Also, who's we? I am a full-stack engineer and feel properly compensated if not over-payed given my expectations.

2) Leetcode has been extremely helpful. Not just in interviewing, but also in understanding how to have more granular control of space/performance. However, it is not the whole picture and I would point people to the famous coding university github: https://github.com/jwasham/coding-interview-university and further push people to follow research and coders they admire such as Peter Norvig: http://norvig.com/

There was a recent discussion here about developer compensation likely following a bi-modal distribution, I'm inclined to believe it, so IMO 1) Most of us are underpaid.

To go from 100k to 200k seems like it would take years unless you jump to one of the FANG companies

What's Blind?

Looks like an anonymous work oriented chat app: https://www.teamblind.com

Probably https://www.teamblind.com/