Interviews are, by definition, a way to discriminate candidates based on some criteria (using the dictionary meaning of word here). There are certain classes that are illegal to discriminate against (e.g. religion, ethnicity), but things like education are totally fair game. Airlines, for example, use physical fitness as a discrimination criteria under the rationale that a flight attendant must be able to function in the rare event of an emergency.

Just because a criteria doesn't match one's notion of "fairness" doesn't mean it's inherently a bad criteria. If Google wants to only hire people that are good at cracking leetcode and that ultimately leads them to have their current reputation of being out of touch, that's kinda on them.