This is speculation on my part but the thing about sex work and pornography is that banks/payment processors consider it a financially unreliable industry, rife with fraud and chargebacks and scams as it is. So they will actually start fucking with websites & businesses that get known for primarily dealing with it - it's why the likes of Tumblr, Patreon, and even Onlyfans have either banned or tried to ban porn, because the costs began cutting in to their own money. And with Idol's issues I described above I wouldn't be surprised if Yuko's changed priorities were mandated by either Idol or Brave who don't want to deal with that. The same potentially goes for Shiina promising porn with Phase shutting it down to a lesser extent.