It may not be. I was just going to Progressive which I think does something similar and iirc they say if they can't get you the best quote themselves, they're okay with that.
Otoh, how IS leaky different from esurance? I don't understand that from their website either.
esurance and progressive actually sell insurance. This site appears to be an aggregation who gets revenue through referral bonuses.
But for the users, that wouldn't really matter?
Esurance is an insurance company, leaky is an aggrigator for insurance prices.