basically, first. if someone threw money at someone via patreon, that one is still just kind of a donor, actually not entitled to get any a thing for this money. it's not a shop, you're not entitled to customer rights of any sort.
i've used to throw some cash at some projects myself in the past, for a variety of reasons. maybe i liked the art style of this one team, maybe i liked the humorous writing of that one. whenever i signed up a sum, i was fully aware of it being a donation on the grounds of liking something about a project. that money is written off my book the moment i send it. consider it gone, for a cause. if a project is no longer too my liking, i could just stop spending on it.
some devs do consider donor opinions for their next stage of development, some of them store those decisions (voting rights, as example) behind a 'upper tier', that's where i see the step into actually paid stuff.
whoever follows Akabur, they do it on their own 'risk' and their own reasons. if they expect a certain something coming out at this exact date, well, he never worked like that, on any of his developments, not from the very beginning.
certainly, to me, too, QT isn't up to par with some of his other games. but being ripped off? i don't see it.