Well there are hscene viewers for gacha (i wish that was the case for all of them since they will shut down after a while like eiyuu senki ww-x) so it's as easy as pirating original novels, but yeah revenue stream is much higher from whales than just b2p premium vns.They got into Gatcha where they earn more than they do making these visual novels. Afterall, it's easy to pirate such games and lose earnings, while there are plenty of fools who would be willing to sink in thousands in a gatcha game (even in one where most of the characters are essentially the same few, just dressed differently).