I imagine some factors are:

• Not liking a game’s engine whether it’s Unity, Ren’Py, or RPGM
• Projects using a subscription model through Patreon and potentially having to track which games have been largely abandoned or are slow to receive updates
• Potentially needing to back too many projects
• Previously buying into games that have been abandoned and being wary of it happening again
• The visual style (ex. Daz3D, Blender, 2D, and so on)
• Grammatical mistakes
• Preferring a linear or open world experience
• A lack of choice or too much choice
• Not enough lewd scenes or bad lewd scenes
• Lots of text explaining actions and thoughts versus showing it visually
• A focus on kinks you aren’t interested in
• Being concerned your friends will see it even though Steam recently started letting people hide games from their public library

There could be all kinds of reasons. I’d like to hear what people value the most and some examples of what made you stop playing, following, or financially contributing to a game.

For example I stopped playing Being a DIK during season two because I made the mistake of sleeping with a character locking me out of interactions with another character. I didn’t realize until later and felt like I’d need a game guide to get the maximum sized harem and all the associated scenes.