Why "reaction" is a format, not a legal exemption
No copyright law anywhere carves out a special category for reaction content -- the underlying analysis is the same fair-use test applied to any other use of someone else's work. The format simply makes the transformative-use question especially visible, since the original material is often shown at length right alongside the new commentary.
What separates a strong reaction video from a risky one
A reaction video built around substantial, specific commentary -- reacting to particular moments, offering genuine analysis, adding context the viewer would not get from the original alone -- reads very differently from one that mostly just replays the source with occasional interjections. The ratio of new value added to original material used is what tends to matter most if a dispute ever arises.
Frequently Asked Questions
Is it safe if I only react without saying much?
That is riskier, since minimal commentary weakens the transformative-use argument. Adding substantial analysis and reaction meaningfully strengthens your position.
Does crediting the original video protect me from a claim?
Crediting is good practice and helps prevent disputes, but it does not by itself prevent a Content ID match or a formal copyright claim.