FAKKU operates differently from most hentai sites. It does not aggregate pirated content; it partners directly with Japanese publishers (most notably Wani Magazine) to license and distribute works officially.
So the subscription is effectively required for meaningful use. fakku subscription
If you are a casual consumer who reads one doujin every few months, the free aggregator sites might suffice for you. However, if you are a dedicated fan of the medium, FAKKU operates differently from most hentai sites