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The react format is not original. It predates FineBros by some years. Even the name being "X reacts to y" predates FineBros. It could not be more unoriginal.

But what Fine was doing was claiming that people were copying them and then trying to lock up the format behind their trademarks.

It's like if you invented the wheel and people started also making wheels, and then I came along and started claiming everyone stole it from me several decades later.