How does themeforest check the license for clipart?

Question

Envato

Dear market experts, could you please tell me:
1) how do themeforest admins check if the cliparts in it are from free stocks?
2) can I make a photoshoot on the topic I need (look book, for example)? How do they check that the photo is my authorship or authorship, roughly speaking, of a person who has nothing to do with the project (a friend of the photographer for the idea)?
On all free stocks, there is outright crap, and not a photo on any topic of interest (not abstract nature-walls-legs in sneakers), therefore, either something of your own or buy (until there is no money to buy). Photo for 20 p. it doesn’t work from the shutterstock, since I don’t have the opportunity to show a screenshot of the deal with the shutter (with all the subscriptions and other goodies).
Thanks for answers.

Answer 1

they check, like on all stocks, authorship: you won’t get caught
until you get
caught - a ban for life (allegedly tears help, if only processed, and not 100% stolen), which with a sent passport is actually for life and there are
licensed ones can be downloaded from the same deposit for the promotion "5 credits per ball", etc.