Why is Sword Art Online so popular?

Related questions

1. Is Sword Art Online an actual game?
2. Is Sword Art Online the best anime?
3. Who is Yuuki to asuna?
4. Is Sword Art Online Alicization coming to Netflix?
5. How does the NerveGear work?
6. Does asuna die?
7. Is there a game like Sword Art Online in real life?
8. Will there ever be a virtual reality game like Sao?
9. Does kirito die in Sao Alicization?
10. Is nostos only VR?

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