I think what they did was ban towers that could be used to allow other towers that do not normally pop lead to be able to damage Dreadbloon (Dreadbloon has lead property). No ice so that you can't use embrittlement, no glue so that you can't use glue storm, no alch so that you can't use AMD and no village so that you can't use MIB. No idea why ban the whole tower instead of just the path, tho.