This Bug is easy to reproduce, doing a quick search for it on YouTube will allow you to know how to do it. And as you are on PC this can be done to make 4 of the same hero, while on console it can only be done to make 3 of the same hero.
The issue is related to the squad spawn bug in Galactic Assault. The patch they introduced this bug was the patch they finally fixed the old method of doing this, which was a lot harder to perform then the new one. Ironic, isn't it?
IMO just learn how to do it, and whenever someone uses it against you, use it against them. DICE will probably never ban someone of using bugs, because they aren't hacks.
As an example, whenever someone enters the walls on Hoth, a day one bug never solved, I just enter there as well and make them suffer. To me it's the best way to get rid of cheaters
