SEO has been a plague in search engines for almost as long as they have existed. Unfortunately combatting it is an endless cat and mouse game, as there will always be some who will devise new ways to game the system. With how commercialised the web has become there’s enormous incentive to do so.
I’m also not convinced Google has much intention of really fixing it. They already have a monopoly on search, and as an advertising company are unlikely to want to upset the big media companies exploiting their search engine.