They don't have to though. They can partner with someone else to run the sidechain node and collect the fees regardless.
Key distinction is that decentralization at the base layer is unaffected. How it plays out on higher level sidechains is up for debate.
If the miners want to validate the sidechain node, they would have to have as much access to a sidechain information source as they would for the mainchain.
They can partner with someone else to run the sidechain node and collect the fees regardless.
The same can technically be said for mining. A node doesn't have to be run and all information and broadcasts can work through using an http api for example.
Key distinction is that decentralization at the base layer is unaffected.
I agree with this.
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