They don't ask leetcode questions for Front-end engineers AFAIK. It's mostly practical Javascript/DOM/browser questions.

Funnily enough though, I heard once you join as a Front-end engineer, you are pretty much a regular SWE and can join any team and work on any tech, even backend/systems.

I mean, they do ask algorithmic problems, but first, they're not "leetcode hard" (leetcode hards can get just insane, it's impractical to ask those in an interview setting), more like mediums, and second - out of 6 or 7 interviews maybe 2-3 will be those. Domain-specific / system design ones are more important. Though that depends on the level they're hiring for, I imagine fresh grads get more "write code on whiteboard" types of questions.

you're forgetting that it's leetcode pulling their problems from the companies' question pool, not the other way around.

This has been my experience as well, same for Amazon.

I didn't practice that much since I hate wasting time on useless tasks, and the interviewer literally told me to just leetcode and read the interview book. I asked him a bunch of web questions and he had no fucking clue, all he did was leetcode and interview every year.