I keep seeing this "subterfuge" guy or whatever his name is and I'm confused as to why he's so popular

2017x. Read: https://continued-exe.fandom.com/wiki/%22Sonic%22_(Sonic_Legacy)

Depends on where you're seeing him.

If it's YouTube, algorithm BS. You saw a video with him and the algorithm thinks you're interested in that stuff.

Anywhere else idk

I've seen him in meme compilations and shit

I'm also into sonic, but not really fnf or sonic.exe shit

Mostly stuff though about people on twitter talking about him, I don't even have twitter, but I've seen tons of memes of him on it.