Agree about privacy. 

By the way, Amethyst (or any other client, I guess) can provide to any npub a shadow ban. Easily. Relays will eat your events, but clients won't show it to anyone. 

For example that's how Amethyst spam filter is working - blocking npubs without your participation, automatically. Default settings. Read the thread:
 
nostr:nevent1qqsv5ag7wy9r53g7763mjq4l66708mjle2vp3ce3v2nygv3ajtf4dmgpzpmhxue69uhkummnw3ezumt0d5hsygqcj6nhm7pe3vyvp9hy6pywf55xvdqtqawr56n9jr8ss2hfcplq8cpsgqqqqqqs0kam6v

The same about relays' spam filters. I think it may mark any account as a spam at some point and stop delivering content to other users. Maybe not all of them at the same time, but it is possible. 

 Understood. I'm not as familiar with the environment here as I would like to. I mainly have the takeaway that nostr lets you own your voice - contrary to legacy social media. 

 Sure you can store your events for yourself. You can make your own relay and your own client. That's open protocol benefits.