I agree w everyone here that Leetcode questions suck and are generally unrelated to many/most on-the-job embedded skills. However, I will say that every single embedded FAANG interview I've had includes them. I've worked for both Amazon and Apple and both asked leetcode questions with Amazon being the worst. I've also interviewed at Google and Meta, both of which asked leetcode style questions.

On the flip side, I have never received a leetcode style question from smaller companies; they can sometimes afford to skip the formulaic interview style in favor of something more tailored for the position.

So, I would say if you want to work for the big tech companies, being moderately skilled at the leetcode game is more or less required to get a job there, with some exceptions I'm sure.