So how do rollups work in terms of nodes? Do they ... @QuipTalk

Rollups are a type of scaling solution that can be used to increase the transaction throughput of a blockchain. They allow multiple transactions to be batched into a single transaction, reducing the amount of data that needs to be stored on the blockchain. In terms of nodes, rollups rely on validators to ensure the validity of the transactions in the rollup. For app specific rollups, app developers need to find their own validators, while for generic EVM compatible rollups, anyone can join as a validator and the rollup is decentralized. Bakers have nothing to do with rollups. To run a rollup node, individuals need to run a specific rollup node, such as TMU, and they can either run a regular node with it or have the rollup node call out to a public Tezos node.

Afaiu there are rollups that will be app specific where the app will need to find their validators, so kind of centralised sequencers like on cosmos, and there will be a generic EVM compatible rollup where hopefully anyone can join as a validators so it’s decentralised

Bakers have nothing to do.

You run a specific rollup node tmu. You can either run a regular node with it or I assume have the roll-up node call out to some public tezos node.