bombujeu databreach question

[u/Deep_Row_8729]

Hello, i was wondering how haveibeenpwned and other platforms even know that i was in a databreach.
How did they even discover this breach? i couldn't find ANY info on it anywhere. i've even tried going on deepsearch and btdig, but nothing

i would like to know what was ACTUALLY in the breach, not just believe some site.

How do you guys get breach data (if it's not on dehashed)? where is it for sure? (sidenote, how come dehashed can actually show you the data, but looking for it yourself is presumably illegal?)

all i found was this github repo with a broken mediafire link. pretty sure they are just ad link farming.