The TOS is clear about any building impeding progress, boss pawns and such. On the server I play on no one can finish the Freya quest because a nitwit has build a sandstone shoebox right over Freya’s spawn point during the last stage of the whole quest, next to Nordof. As such, Freya spawns half into the foundations of said base and thus cannot move forward to the encampment.
We had a discussion in the chat about this and it seems the offending player has been advised on several occasions about this but opted to ignore everyone and keep his damn shoebox where it is despite being asked to simply move his base just a few blocks. Of course, I wrote a ticket about this and in the chat other players said they also put in tickets. Unfortunately nothing has been done and no one can finish that questline.
So, what good are the TOS then?

