Gold Nugget… was considered to have a "facial congenital deformity."
It was born without a mouth, and naturally didn't have beautiful fangs. It looked very weak and was often bullied by its own kind.
Even though it could clone itself, the clone's strength was halved while the number of beatings it got was doubled.
Venom was just as weak and was also bullied by their own kind.
Gold Nugget's only consolation was that Venom had it worse.
Because it was too weak, Gold Nugget had been thrown onto a meteorite as a test subject back then to look for a suitable planet to inhabit.
Now, the similarly weak Venom had become the second test subject.
After Gold Nugget came to Earth, it envied Luke's concern for Dollar and how Selina valued the dog's company.
The moment they officially accepted it into their fold, Gold Nugget decisively betrayed the symbiote race.