How do cs:go case simulators work?

Question

PHP

Randomly dropping an item is easy, but how is the item transferred to the player?
My guess:
1. The player opens a case on the site.
2. He gets %weapon%
3. The bot buys this weapon on the steam trading platform.
4. Gives the weapon to the player.
I saw a lot of similar sites of the same type, so someone has the source? Where can I see/buy?
gabecases.ru
csgo.ms
free.csgoru.ru

Answer 1

For the most part, it's a scam.
But, it seems to me, each piece has its own unique ID, which matches both on the roulette site and on the Steam TP. The bot looks for this item at the lowest price, redeems and throws an exchange. Something like that, IMHO.

Answer 2

This is not a scam, I tried to open it myself on the site https://csidol.com/ everything turned out, they did not deceive me! I advise!