Single point of failure for ANY eth staker

You can launch the staking launchpad locally, but it does a few requests to external sites.

For example, there is an api call that sends all beacon chain validator pubkeys

https://github.com/ethereum/staking-launchpad/blob/d25870fabccdc9b896fa6d061bdfbc2f87990ec1/src/pages/UploadValidator/validateDepositKey.ts#L110

1. If the beaconchain scanner goes down, you are not able to deposit the eth!
2. If the beaconchain scanner goes hacked, they can output invalid data or maliciously track stakers
3. There are issues like #425 which make it impossible to make deposits

Assuming folks who want to stake run their own nodes, why isn't there a way to query local beacon node for the same node?

If there isn't a way to query local node right now, there should be an alternative way of making the query. If there was an offline way, that's ideal.