Yes, the social souroundings of your node need to be tight as well, to ensure your identity is anonymous and protected. Recalled a couple of options I forgot yesterday, wanted to mention them since they are important:
don't use public mempool sites to look up tx's. this could allow malicious sites to relate your identity (IP) to tx. Better always use your local mempool instance from your node
don't use umbrel. Better go for a bare-metal setup, where you only install what you need, and everything is validated by the open source community. Raspibolt is a key here, and has most of the apps you may be used to use as install guide (including mempool, see above)
you may ditch twitter and telegram completely, and go full #nostr. It's a vivid bitcoin and lightning community, and helps you to stay completely anonymous and away from centralised social media services
On your last question on OS updates: This was more about security, not about privacy per se. But if your security is weak, it creates attack vectors to expose your identity, too. So keep a natural habbit keeping your OS up-to-date secures your stack and your identity. One more thing: #raspiblitz has everything Tor'ed (even OS updates), so your ISP basically doesn't know shit about you
running bitcoind
running a linux system
transacting with lightning
The drawbacks are speed and reliability as @1fatmess mentioned further below. But as long speed is not a key factor, tor is a great obfuscation method.
Yes, the social souroundings of your node need to be tight as well, to ensure your identity is anonymous and protected. Recalled a couple of options I forgot yesterday, wanted to mention them since they are important:
On your last question on OS updates: This was more about security, not about privacy per se. But if your security is weak, it creates attack vectors to expose your identity, too. So keep a natural habbit keeping your OS up-to-date secures your stack and your identity. One more thing: #raspiblitz has everything Tor'ed (even OS updates), so your ISP basically doesn't know shit about you
The drawbacks are speed and reliability as @1fatmess mentioned further below. But as long speed is not a key factor, tor is a great obfuscation method.
Hope this helps and adds to your research list