Its pretty much the way for all good HTML games isn't it, most are rubbish from the get go. But the ones that are good struggle to maintain it and just pitter out to blandness. Its a problem for porn games that focus on corruption in general genre, once you've got over the initial story arc of corrupting women then what.
Photographers lies, casting director, the company, the therapist. Were all some of my favourite games on here but they all either got abandoned or the quality fell off a cliff.
A big part of it is the patreon issue. Devs aren't getting paid to complete a game, if they complete the game they risk loosing their revenue source. Look at Glassix it was great for a few years but has just been releasing turgid up date after turgid update for what feels like 5 years. Sometime Devs need to take a look at there pipeline and if they've run out of ideas, kill off the project and start a new one.