[3] Did this affect anyone (e.g. they were using their hacks in PvP)?
Yes, the invasion kills hardmode quickly and become an annoyance for players at spawn
[4] Evidence. (If this includes chat, Phase link one or more messages)
From yesterday
i might not have proof but if you ask some regulars because resets that he previously had participed on also hardcore spammed invasions (mainly pirates)
He also barely talks in chat and ignores the complains abt it, not to mention how the invasions can bug out the npc spawnrate, in the process never letting them arrival
He resorted into activating pvp and and enabling tpallow to avoid people encountering him at space, i managed to kill him a few times but he managed to do it