after all it's a patronage. they don't pay him for anything 'ordered work', there's no obligation on either side. any subscriber of his patreon is free stay or leave, to toss a coin or stop sending money, by their own choice..
well minus the roadblocks patreon generates when you want to immediately stop something but whoever still supports anything on that platform, might know about those. it's one reason why i left patreon altogether, never to look back.
in short, people give him money for reasons, and he doesn't have to do a thing. still he does, at his pace, and at the end ot SC34 he himself posted about it ending there, with 'some day' possibly a sequel but he also back then already announced to do something else.
also, mind you, he still does hand drawing, pen&paper, which in itself takes more time than CG.