I feel like that's kind of a shitty business thing to do. I think they should do exactly what they do with the other Ace Attorney games on mobile and have the initial download be free with $15 for the rest of the game.
To be fair, Apollo Justice only has four episodes, and the first episode is about as long as the first two of the trilogy together, so that would be giving away a pretty significant amount of content for free. But I understand why you feel that way and I hope it doesn't turn people off.
Also, I've played through the first half of episode 1 and decided that the game looked and played nicely enough to warrant purchasing the rest of it. It's so shiny. It's honestly a much better looking upscale than the iOS version of the trilogy, and also doesn't have the weird frame rate/lag issue that was occasionally a problem in that port. Definitely recommend checking it out if you haven't played Apollo Justice in a while and want to play it without the weird mixing of new and old sprites (I was always so distracted by how good the new sprites looked in comparison to others like the Judge or some of the sprites in episode 4). I personally haven't played Apollo Justice all the way through in about three years, so it's probably the Ace Attorney I'm most rusty on. Here's hoping I have a fun time!