It..it really is bad luck, and I type that knowing all too well about it. FE Heroes, DBZ Dokkan Battle, Memory Defrag, Injustice 2, etc.
Although I've never spent money on gacha games I sure have spent a lot of time playing & pulling characters in them.
A shame in this case it's pulling the same character 7+ times. Although not like my luck in the other games are any better. Have a small army of Hanas & Olivias...
Add 1-2 more Peacocks, 2 more Basslines, & 1 more Cerebella to that picture & you'll have my full roster of repeats.
It is a shame to see that you spent $50 & didn't get any gold though. Some games have guaranteed gold packs or bundle packs, for $20-$80, that also bring a specific Gold and their premium currencies.
Luckily the premium currency for this game seems to be generous early on. Campaign & the dailies. Hopefully you'll have better luck...in the next couple billion pulls.