The more you practice, the less you bleed in battle. The more you prepare for interview and study, the less you compete in the job market. People who study Leetcode have virtually eliminated a lot of competition in the interview market alone. Now what's left is the competition between Leetcode practicioners.

Leetcode is the best investment I've made in my career so far. I've outearned most of my peers (and people more senior than me), easily. Just by doing Leetcode I can eliminate 90% of the competition? Sign me up!

Why not just let the problems sort itself out?

If the students want to cheat, let them cheat. The students who really want to learn will learn. This makes the competition between them better. The bottom of the barrel will continue to be the bottom of the barrel, and the successful ones still become successful.

We really should stop ascribing to "no child left behind" thinking, and instead encouraging competition between them.

Who's gonna work the low paying dirty jobs after all if everyone is smart and capable? It is called "economic ladder" for a reason.