Indoor you can grow a plant as big as you want it before flowering by manipulating the light schedule. 18-24 hours of light and the plant is in grow mode. Lots of leaves and reaching out. You can grow it like this until it is as big/bushy as you like.
Then the lights are cut back to 12 hours and less and it tells the plant to stop growing, and switch to flower mode. Average 60 days later it is done.
So the pics you mention are plant that someone grew out (vegged) till it was huge then switched it to bud. It had been in bud mode for 12 days.
Hope this helps you.
peace.