I don't even know how this would work, but basically as a libertarian I started as against borders because they are government-created boundaries

Then I recognized that without borders it seemed difficult to decide who was and wasn't a citizen and that wasn't fair, and that it seemed like certain people in government wanted to bring in more people to get them to vote to destroy freedom, so actually the libertarian position would be for borders to protect freedom

However, now with covid we also see borders being used to prevent people from moving - some people have been stuck in countries they attempted to live in temporarily or were on vacation at, or haven't been able to visit countries because of border restrictions

The libertarian (ancap) position on borders is that private borders are fine (like, on land that a person owns, they can choose who can "immigrate" to it or not, or like private cities can decide who is allowed to visit)

So are any conservatives against borders or what do you think of this issue in light of recent developments?