That strikes me as highly reflective of google’s position of power; from the employer’s perspective, the point where the diminishing returns are no longer worth it is related to the point where they’re losing too many applicants from interview exhaustion. If you’re not google, not offering the kind of pay and such that google does, your break-even point is likely much sooner.
Additionally, from the worker’s perspective, the only-3-interviews rule is an assertion of our power. And, as an added plus, if enough people adhere to it, it will shift that break-even point even for places like Google, and resist the shifting of that burden onto unpaid workers.
Fun fact, any game dev’s financial data can be stolen if you’re capable of answering my riddles three