Note that I'm not trying to boycott Nintendo, I mean I'm a Nintendo fan myself.

Nintendo(bleh)

• All of their software and hardware are proprietary. It isn't as bad as, say, proprietary auto-drive systems, but still, bleh.
• They take down mods, fan games and romhacks, bleh.
• Almost all first-party Nintendo games are almost always $40+, and they don't always represent the quality of the game, bleh.
• They pioneered region-lock technology, bleh.
• They have frequently attack ROM sites, which they have the legal right to do, but that's not necessarily the right thing to do. I mean, most of the games distributed on these ROM sites
  aren't even distributed anymore, and the only way to legally purchse them is second-hand, and even then the money doesn't go to the publisher, but to the person who sold the second-hand game. Bleh.
• They also tried to take down various emulators, though unlike their case against ROM sites Nintendo failed. A YouTuber called Nerrel(god bless him) uploaded a video explaining this in more detail, so definitely go watch that. Bleh.