>Are anthologies of poems copy writable? I thought not.
Then you thought wrong[0]. While the poems themselves may be copyrighted by others, the editor (presumably getting license/permission from copyright holders of said poems) organizes the poems in the anthology. The resulting work is copyrightable in its own right.
Check out the link below and the copyrights on each anthology.
[0] https://www.theguardian.com/books/2018/oct/03/top-10-poetry-...