Question regarding Ethereum

More specifically, I am curious about some Eigen layer concepts. If anyone is able to answer a few questions that would be amazing!

• is Eigen layer going to allow validators to simply perform tasks such as data availability or oracle services, or will this also allow for new blockchains to be created entirely, that leverage Ethereum security?

• will each new task, or chain, require an additional node, or will each validator leveraging Eigen layer, simply run an Eigen layer node?

Thanks, and if I need to clarify either question, please let me know.