About the ethical question...
To use copyrighted music from video games (even graphic material as well) is a common practice among RPG Maker users since its beginnings, a custom from more than a decade ago. RPG Maker games with original assets including music were really rare and you could count them on the fingers of one hand. In this case, consider that the Indie Game development wasn't so popular and serious as it is today, and those games were limited to niches and relatively small groups of people. People didn't aimed for money or for global recognition, and (at least in my opinion) this didn't cause any damage for the traditional gaming industry. How many of you have used a custom midi files of famous games from VGMusic on your projects? Well, I've used A LOT and I have no reason to hide or regret about it. Be it midis, MP3, sprites ripped out from Spriters Resource and so on. I also discovered a lot of new games and companies not only on the searching process, but that also were presented to me on the rm games made by other people. "Wow, that tileset is beautiful! Rudora no Hihou? Never heard about, I'm going to check it! (on my pirate emulator of course)". It's also important to consider that it wasn't easy to find free licensed material of good quality as it is today, and few people had the skills to do it by themselves (for what I can tell, majority of users always were kids and teenagers, both inexperienced with game development).
But today there's some big things that change this scenario. First one is that RPG Maker is officially supported on the west, discouraging piracy and encouraging the usage of licensed assets. Second and maybe most important is that this is the Golden Era of Indie Game Development, so I'd say the overall "innocence" of making little games is not really the same anymore. Intellectual property is highly valued (what isn't wrong by any means), and to make games using anything unlicensed is seen as anti-ethical or even offensive by some people. Today there's much more alternatives though. A lot of royalty free material is available if you look well enough and there's even communities dedicated to provide assets, like opengameart.org that contains even public domain material. Actually, there's a lot of Japanese blogs dedicated to produce RPG Maker material and they aren't really new but well... not everyone who have the skills to find them. So, if using ripped material is not ok by the majority today, at least there's options for people who cannot afford or produce your own (even if your library of options is much more limited).
I think this is a topic that should be seen by the two sides of the coin. For one side, kids and teenagers can be making games without big pretensions just for fun, looking for what is accessible and making homages for what they like, and I really doubt that using music from a Final Fantasy game can bring any bad for the industry, principally if everybody knows from where it is and if no one beyond a small community is playing it. On the other side, using copyrighted or unlicensed material in inadequate manners (like omitting where you get something from, committing plagiarism or trying to get commercial benefits) can't be seen as an ethical and tolerable attitude, principally in a era where there's a lot of independent artists fighting every day to produce their own material and have their own merits for bringing something original in fair manners.
I understand and I don't blame people that want to use a famous cool music from a big game on their small game if they are giving proper credits and if they aren't being pretentious. But I can't agree with the idea of "all art should be free even if you don't want yours to be, IP is BS", neither. Art and artists should be respected and original content should be valued, principally the small ones. In the end is a matter of having a good sense in your choices and analyzing what can be ok and what can be detrimental.