I don’t know if the boundless community considers the action of making towers of lava that go from sea level to sky limit griefing, but I certainly think it is so. This is clearly made to bother other citizens. Here is something that has been going on on Raxxa for a while:
These can be seen from all over Raxxa and the user refused to lower his/her first tower when asked by TopazMoon. Now a second one popped up and a single row of block to the sky. This user wants to be seen and doesn’t care about what others think.