this is only a concern if you are storing your private keys on that bitcoin node.
I would never store my private keys on anything other than a hardware wallet.
Discussion
let me know if you have any more questions, i am happy to help! atleast with the knowledge and experience that I do have, not saying I am an expert, but a junior expert MAYBE lol
Do you pay for mynode or is the free version good?
The free version is great, i only paid to activate pure tor connections to peers and remote access over tor. But id you dont need tor then the free version you will be happy with. But yeah if you run thr nostr relay too you might want to oay to activaye the to features for security snd other things. Totally worth it.