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Thank you all who have watched my blender tutorials and animations!
It means the world to me!
So how to make this background animation in Blender's Grease Pencil?
1) draw bunch of strokes
2) add noise modifier
3) increase noise scale
4) turn off randomize
5) animate offset from 1 to 0 or 0 to 1
6) lower opacity of small strokes
7) duplicate object
8) increase thickness a lot
9) add tint modifier, animate change of color
10) ? profit