Vladimir I think because they invested and hence they need to get returns for investment? I haven’t heard of anyone who invested and not wish for any returns.
But nonetheless, I agree that Qidian started all these. If only they never force translators to come to this platform using their “rights”, then we can still read for free on other sites and we still can subscribe to patreon for advance chapters!!! seems like that had been halted too because of going premium.