You got exactly what I was going for when making that statement, but I won't hold on to a position that has clear holes in its defense.It's not about the platform, but about the responsibility and moral liability of a dev.
As he said, the main difference between the two is that on kickstarter a dev has to promise something (product X, with Y amount of content at releasedate Z) and should of course deliver on what he promised. After all, that's what people payed their money for and they have a (moral) "right" to get what they were promised. If the dev doesn't deliver at the end, they have every right to be upset.
On Patreon the whole concept is tailored to towards "patronage" and most games have simply do not have a concept of said targets for X, Y or Z, so it's up to these patrons to decide whether the dev is still worth his money or not. If a patreon dev doesn't deliver, his patrons have little to no moral right, because it was on them to see if the project was going as it should have or not.
Kickstarter has of course the huge benefit that a dev knows his budget from the start and is able to plan accordingly, which makes the whole development a lot easier. On patreon it's much more volatile and most devs have to change their plans several times accordingly.
My basic argument was indeed that kickstarter projects are generally framed in a way where they say they will deliver a product if they get x amount of money (unlike patreon where they are just working on whatever and people can pledge if they want). However, I was not as familiar with their system as I am with patreon when making the post. With some more digging around, it seems like kickstarter projects indeed do not have to have any rewards. For example, there was a kickstarter for opening a branch of dance studio in another city. Reward for the basic level was nothing. Rewards for tiers after that were for merchandise like shirts.
So fundamentally, the kickstarter system itself doesn't really dictate that the devs reward backers with the thing the kickstarter is raising money to do. Plus, my misuse of the term "investment" is something I realized after that fact. In general, investments are made in exchange for equity or a stake in the project. Kickstarter doesn't work that way. Lets drop this topic with this XD I can feel the nuke coming.