Technically you do own the domain, although the registry and most registrars retain the right to revoke it based on their abuse policies; There are enterprise-grade registrars that have contracts without these provisions (like CSC Global[0], which Disney uses[1]) if you'd like to remove this risk.
It's impossible to be completely impervious to all threats, but for your domain name there are some options that may help. For instance there are domains sold outside the reach of specific jurisdictions[1] and there are blockchain dns efforts as well[2].
Yes. But if you consider it in terms of "potential to be messed with" - the surface area is much less.
Technically your IP address could too
Not if you have a trademark.
Tell that to the people who have be completely de-platformed over the last few years.
Everyone agrees that most, if not all, of them are horrible people, but it is totally possible to lose your domain name if no one will provide registrations and such services to you.
I can't remember any of them losing domain registration. They lost hosting providers and DNS hosting. Did I miss someone?