Duplicate object in instance, give it random action

cube_action.py

import bpy
from random import uniform

def random_scale_action():
    action = bpy.data.actions.new("RandomScaleAction")
    data_path = "scale"
    # (frame, value) for keyframe point
    for axis in [0, 1, 2]:
        # new fcurve
        fc = action.fcurves.new(data_path, index=axis)
        # add a new keyframe point
        fc.keyframe_points.add(count=2)
        for kfp in fc.keyframe_points:
            kfp.co = (uniform(1,100), uniform(0, 1))

    return action

context = bpy.context
scene = context.scene 

# create a group and add the selected objects to it.    
collection = bpy.data.collections.new("CubeGroup")
scene.collection.children.link(collection)

for obj in context.selected_objects:
    # remove any animation data.
    if obj.animation_data:
        obj.animation_data.clear()
    collection.objects.link(obj)

# create 20 randomly located dupli_groups.
for i in range(20):
    obj = context.active_object     
    me = obj.data
    me_copy = me.copy()
    
    ob = bpy.data.objects.new("Mesh Copy", me_copy)
    ob.location = [uniform(0,10) for i in range(3)]
    context.collection.objects.link(ob)
    
    # Add action to instanced object
    ob.animation_data_create()
    ob.animation_data.action = random_scale_action()
    
    bpy.data.collections[collection.name].objects.link(ob)
    
    context.view_layer.update()