Question

why does the bottle explode?
the gas produced from the reaction causes the pressure.
the plastic is weak from the acidic vinegar.
the video is photoshopped.
the bottle was made of glass.

Explanation:

When a chemical reaction occurs inside a closed - bottle and produces gas, the volume of gas increases the internal pressure. If the pressure exceeds the bottle's strength, it explodes. Weakening of plastic by acidic vinegar doesn't typically cause an explosion immediately. Suggesting the video is photoshopped is an unfounded claim without evidence. The material of the bottle being glass doesn't explain the explosion. The gas - pressure explanation is most scientific for a chemical - reaction related explosion.

Answer:

The gas produced from the reaction causes the pressure.