To add something more to this: there's a lot going on behind the scenes of a full node. And here is explained in details: https://developer.bitcoin.org/devguide/p2p_network.html

To point out again: all those saying that are running an "Umbrel node to help the network" (with whatever node software) are just virtue signaling, not helping at all the network.

When you will open the (default) port 8333 for seeding more than 8 connections and run your node with 100 GB mempool, let's see if your shity RPi Umbrel node can handle it. Because that is a real bitcoin node that will help the network.