probably losing interest plus isnt making as much on itch.io alot of devs who make good games get burned out and just stop.. there are a few that even will ban you for mentioning them being burned out and dont really wanna finish it. they are in it for the money at that point and drag out the release dates and sooner or later will lose all his following.. happened to a few ive watched then make almost 7k a month in subs and then get burned out and make excuses for months and by the end of his lies he only makes about 600 a month and still doesnt want to finish the game.
edit: i will say i fucking love this game but unless there is a good reason for updates to take half a year which one hasnt been given i stopped my sub on patreon.. especially when the updates are done after 20 mins of reading