Thanks, I didn't know that about platformism. I'm always hesitant to bring up practical examples of functioning anarchy because of arguments "that is not really anarchism because X".
RE Makhno: Makhno's armies in Ukraine were not platformists. Makhno came up with the idea of platformism after his exile - he basically adopted a lot of Bolshevik organisational ideas in an effort to help counter the success of Bolshevik parties and the failure of Anarchist groups at the time.