Wow, I remember seeing one of ur videos from r/leetcode. It was the one that was like counting subsets that sum above some value. It was really a neat solution. Imo, these problems don't require so much background knowledge and are more based on creativity, so I guess the companies are trying to hire those sort of people.

there is no need of a quant channel, there are already plenty of good channels. You should focus on improving your coding skills instead.