Who is the asshole who has decided to introduce such an absurd censorship? For this, don't bother making a doujinshi hentai, if there is a paid version without this stupid censorship, why the hell do you publish the most censored version?
Artists then: Invents "black bar" censor to circumvent Japanese censorship laws, trying to obstruct the least amount of artwork from the audience as possible while still appeasing the law.
Artists now: Use the ugliest, most obstructive, most intrusive censorship that they can find because now everyone deserves money from their hobby, and they think people can obviously afford dozens upon dozens of $5-10/mo. uncensored artwork subscription for each and every individual artist they come across each month.