Let's talk about the two types of proofs in Rollups:
Once a fraud proof is upheld, the incorrect result is overturned, and the party that submitted it has its deposit slashed.
The sequencer can determine transaction order; mature Rollups allow users to bypass the sequencer and force-submit transactions via the mainnet, preventing transactions from being censored for an extended period.
$ARB 0.1594(-2.03%)

I'm just sharing my opinion; this is not investment advice.