They are not 'deliberately made to look like every other submission', they simply look like every other submission because that's what HN submissions look like. If they were made to stand out you'd likely be complaining that they get even more preferential treatment because they stand out.
If you don't like them just ignore them.
There is nothing misleading about them and they don't trick users because the vast bulk of the visitors to HN knows what these are and if you didn't it's explained in the docs.
They don't trick you into buying anything and they don't serve to market the product of the start-up that is posting the position. The only difference is that they don't have to wait until the 1st of the month and that they get to post an item all by themselves, which seems like a pretty small price to pay compared to say having a site full of advertising or some massive commercial drive.
HN is rather more than less restricted whenever the companies that YC invests in come up, this is the one exception.