Is bunkers shutdownable by governments?

I think by the time it goes mainstream initial setup will probably include a nsec bunker and the user will be mostly unaware of what their nsec is.

Does anyone know why some of my #nostr direct messages don't show up in some apps but they show up in others? I've got lots of relays, and I've also paid for a few including nostr.wine, but I guess I'm missing something. Just as an example, one of my direct messages shows up in Amethyst on mobile, but not on any of the desktop apps that I've tried. #asknostr

Thanks