HelpIn-game items unlock

Hi everyone,

A few people on reddit are regularly posting leaks of incoming skins, uniforms etc.

For example:
https://www.reddit.com/r/Rainbow6/co...DO&sh=a18e95dbⓘ

Or:
https://www.reddit.com/r/Rainbow6/co...CX&sh=2da03857ⓘ


How can I do this by myself? What should I learn and where to start?

I guess they work for ubisoft or just got them from their workers and leaked them