They keep repeating the fact that this is only the Midgar portion of the original story at every turn (and we've known this since late 2015 or early 2016, so it's not like this was just springed on us) and it's mentioned at every official source (SQEX Store, official website etc.) of the game AND in the description on the box that this is only the first part of a bigger remake saga. They've also been pretty open about their reasoning for why they are calling it just "FFVII Remake" (adding a subtitle could make this seem like a spin-off/sequel, "part 1" can make it seem like it's some Telltale type episodic thing). They aren't hiding the fact, they just think that there's enough content in this first part that people will be satisfied by it.
If people go in and blindly buy stuff even though the information is readily available and touted at every turn, it's not entirely on the companies if the don't meet some expectations that were never promised. Besides, it's not like this is just some few hour experience. This is supposedly as volumous as mainline FFs usually are, so I very much doubt that anyone will be all that disappointed after having possibly gone through ~30 hours of the kind of game that the demo promises. Well, they might be disappointed in the sense that it'll be a long wait for the next part, but I doubt anyone will feel cheated out of their money just because this ends at the end of Midgar.
I mean, Marvel didn't advertise Avengers Infinity War as Part 1 (and it originally even was called part 1 & 2) even though it very much was the first part of a duology. Like, yeah, sure this is for marketing reasons. I just don't see where's the crime against humanity in all of this that makes some of you so angry, when they have been open about the multi-part nature of this remake for half a decade.
