I see the similarities, but I wouldn't really call this a rip-off/plagiarism. The melody is different, the beat is different, hell it's a different genre.

I'd rather picture Jon heard that somewhere, liked the melody, and had it stuck in his head while writing, so something similar came out of it.

I think the chorus SNGMSM is more similar to Nickelback's than the one of TBTN to this...