There's homages, even subtle ones, and then there's plagiarism. Plagiarism is when someone else it taking credit, not just referencing or borrowing but passing it off as their own.
BGC's example is a good one. It's not a case of a BGC fan referencing or borrowing parts of others' works to honor or flatter the other remixers, but rather an act of passing it off as BGC's work.
(of course, someone not doing the research might think this BGC thing is some music-making community devoted to making video game music arrangements, or perhaps it's a case of convenient sorting on an ipod by someone who doesn't know what a playlist is)
The point is still that there's borrowing/referencing (no credit given, no credit taken), and then there's stealing (credit taken).
Welcome to ocr, Gwilendiel. You don't yet know how ocr works, so think things through from our perspective before making bold statements about artists, music, life, the universe, and everything.