This is classic Streetlight Effect [0]. Just because it's easy to test leetcode, and it appears to have something vaguely to do with coding, it gets used.
Like I said in other posts, I would use the "pick a bug and fix it" method. But I'd also screen down from 100 candidates to ~20 or so before getting into technical interviews.
And, again, I don't think leetcode will scale well to 100 interviews either. You need technical staff in that interview room, and if you subject your team to 100 technical interviews using leetcode they're not going to be happy about it.
