Do multiple opposing AI factions attack each other?

Brawnen and Heirs Co-Op 1, Skypact: can the Brawnen and Heirs construct spires from a landmark reward?

Co-op Brawnen and Grovetenders 2, Anomaly Thine: what is the heir mark in Wave 1?

Co-op Horizon's Wrath and Grovetenders 1, The Black Ball Line: which hexes does the second set-up bullet refer to?

Co-op Keel 2, Shadow and Light: on which hexes does the AI construct its spires in Waves 2 and 3?

Co-op Narora and Grovetenders 1, Strange Incursion: should I set up earthscapes even though there is no market?