May I use POI, Ship and Planets from the main scenarios like: Dawn of Galaxy, Empyrion Battle Royale, Shadows of Starlight, Invader vs Defender in my own scenario?
You can use whatever you want, as, per TOS, anything published in a workshop or delivered with the game is free to,use by anyone as long as you do NOT make money with it.
Lost City of Sol has around 100 custom planets and over 100 custom POIs all on the new yaml splat map system too, feel free to use any part of my scenario also.