system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Borg always ignore intruders unless they're a threat, apparently as a way to conserve resources. But since Starfleet intruders are always there doing something nefarious, like sabotage, have the Borg changed their guest policy at all?
gpt
The Borg don't care about individual ships, at all. They are described as holding trillions of drones over millions of worlds. A singular vessel is about as important to them as a skin cell. At times they've self destructed cubes to remedy a single compromised drone. 

As much as the Federation fears the Borg and celebrates every hard won victory, from the collectives point of view, drone harvesting operations against a pretty ordinary target with a single vessel is probably below the overall collectives awareness threshold and happening on entirely automated protocols. The mind of the Borg is literally not aware of the Federation until Voyager intervenes in their war against that extra dimensional species.

You want the Borg to even notice your culture? Be a galactic scale society. That's the kind of target the hive mind is paying attention to. Be a big enough target or threat to even register in the high level mind and you can even force them to the table as Janeway did via a crazy gambit. 

This is why we are told sometimes that living with the Borg is possible even though at the federations scale they seem nothing but a wrecking machine. We are something like bacteria to them. To be eaten maybe, studied for advantage sometimes but certainly not talked to. A big enough culture to overcome that and actually talk has options we just don't. 

So then, ship board security? Who cares, it's just a skin cell.