The primary criticism of the term 'voluntarism' lies in the myopia of some people that see totally voluntary interactions occuring regularly. I find that there is more of a voluntary-coercive spectrum and most interactions lie in between. The gun in the room is not always plainly visible.
Liberdon is a Mastodon instance for libertarians, ancaps, anarchists, voluntaryists, agorists, etc to sound off without fear of reprisal from jack or zuck. It was created in the wake of the Great Twitter Cullings of 2018, when a number of prominent libertarian accounts were suspended or banned.