This is an interesting attack vector. 

To avoid this the idea is to have several oracles which behave exactly like multisig on the bitcoin blockchain. For example, 2 of 3 oracles which need to agree on the BTC/USD price on various bitcoin exchanges.
This way the attack you were describing is harder to accomplish (but not impossible). 

There is new [exciting research](https://eprint.iacr.org/2022/499.pdf) on oracle signatures which would make signatures and verification more efficient and we could easily have NofM oracles with N>10 or more.

bonomat

по этой причине рождается 1001 место с покупкой и продажей монет. цена будит одинаковая везде. 

selfish_gene

bitcoin

Introducing 10101 - One app, all things Bitcoin (aka a LN-wallet with DLCs)

I'm very much afraid of the following scenario: people love the stable USD thing but the contracts used to stabilize them are secretly sold by none other than the BTC/USD price oracle. Once there's a billion paper USD in people's wallets, the oracle proclaims that the price of a USD is 0 sats and runs away with everybody's money.